|
Consolidated Statements of Equity (USD $)
In Thousands, except Share data, unless otherwise specified |
Total
USD ($)
|
Preferred Shares
USD ($)
|
Common Shares
USD ($)
|
Additional Paid-in Capital
USD ($)
|
Cumulative Distributions in Excess of Net Income (Loss)
USD ($)
|
Accumulated Other Comprehensive Income (Loss)
USD ($)
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Noncontrolling Interests
USD ($)
|
Corporate Office Properties, L.P.
USD ($)
|
Corporate Office Properties, L.P.
Common Shares
USD ($)
|
Corporate Office Properties, L.P.
Accumulated Other Comprehensive Income (Loss)
USD ($)
|
Corporate Office Properties, L.P.
Noncontrolling Interests
USD ($)
|
Corporate Office Properties, L.P.
Limited Partner
|
Corporate Office Properties, L.P.
Limited Partner
Preferred Shares
USD ($)
|
Corporate Office Properties, L.P.
General Partner
|
Corporate Office Properties, L.P.
General Partner
Preferred Shares
USD ($)
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Balance at Dec. 31, 2011 | $ 1,205,899 | $ 216,333 | $ 720 | $ 1,451,078 | $ (534,041) | $ (1,733) | $ 73,542 | $ 1,205,899 | $ 972,107 | $ (1,837) | $ 10,496 | $ 8,800 | $ 216,333 | ||
| Balance (in shares) at Dec. 31, 2011 | 72,011,324 | 76,313,112 | |||||||||||||
| Balance (preferred units) at Dec. 31, 2011 | 352,000 | 8,121,667 | |||||||||||||
| Increase (Decrease) in Shareholders' Equity | |||||||||||||||
| Conversion of common units to common shares (54,550 and 279,019 for the six months ended June 30, 2012 and 2013, respectively) | 696 | (696) | |||||||||||||
| Shares issued to the public (in shares) | 6,900,000 | ||||||||||||||
| Shares issued to the public (in dollars) | 165,665 | 172,500 | (6,835) | 165,665 | (6,835) | 172,500 | |||||||||
| Costs associated with shares issued to the public | (5) | (5) | (5) | (5) | |||||||||||
| Exercise of share options | 12,667 | 12,667 | |||||||||||||
| Exercise of share options (in dollars) | 189 | 189 | 189 | 189 | |||||||||||
| Share-based compensation (shares) | 139,472 | ||||||||||||||
| Share-based compensation | 7,181 | 1 | 7,180 | 7,181 | 7,181 | ||||||||||
| Restricted common share redemptions | (133,081) | (133,081) | |||||||||||||
| Restricted common share redemptions | (3,219) | (3,219) | (3,219) | (3,219) | |||||||||||
| Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 524 | (524) | |||||||||||||
| Comprehensive income | 21,029 | 21,600 | (1,984) | 1,413 | 21,029 | 14,145 | (2,099) | 461 | 330 | 8,192 | |||||
| Dividends | (47,821) | (47,821) | (50,493) | (41,971) | (330) | (8,192) | |||||||||
| Distributions to owners of common and preferred units | (2,672) | (2,672) | |||||||||||||
| Distributions to noncontrolling interests | (648) | (648) | |||||||||||||
| Adjustment to arrive at fair value of noncontrolling interest | (1,827) | (1,827) | (1,827) | (1,827) | |||||||||||
| Balance at Jun. 30, 2012 | 1,343,771 | 388,833 | 721 | 1,447,781 | (560,262) | (3,717) | 70,415 | 1,343,771 | 939,765 | (3,936) | 10,309 | 8,800 | 388,833 | ||
| Balance (in shares) at Jun. 30, 2012 | 72,084,932 | 76,332,170 | |||||||||||||
| Balance (preferred units) at Jun. 30, 2012 | 352,000 | 15,021,667 | |||||||||||||
| Balance at Dec. 31, 2010 | |||||||||||||||
| Increase (Decrease) in Shareholders' Equity | |||||||||||||||
| Distributions to noncontrolling interests | (648) | ||||||||||||||
| Balance at Dec. 31, 2011 | 73,542 | ||||||||||||||
| Balance at Dec. 31, 2012 | 1,436,499 | 333,833 | 809 | 1,653,672 | (617,455) | (5,435) | 71,075 | 1,436,499 | 1,089,391 | (5,708) | 10,183 | 8,800 | 333,833 | ||
| Balance (in shares) at Dec. 31, 2012 | 80,952,986 | 85,020,528 | 4,067,542 | 80,952,986 | |||||||||||
| Balance (preferred units) at Dec. 31, 2012 | 352,000 | 352,000 | 12,821,667 | 12,821,667 | |||||||||||
| Increase (Decrease) in Shareholders' Equity | |||||||||||||||
| Conversion of common units to common shares (54,550 and 279,019 for the six months ended June 30, 2012 and 2013, respectively) | 3 | 3,575 | (3,578) | ||||||||||||
| Shares issued to the public (in shares) | 4,485,000 | ||||||||||||||
| Shares issued to the public (in dollars) | 117,913 | 45 | 117,868 | 117,913 | 117,913 | ||||||||||
| Exercise of share options | 32,756 | 32,756 | |||||||||||||
| Exercise of share options (in dollars) | 636 | 636 | 636 | 636 | |||||||||||
| Stock redeemed or called during period, value | (84,750) | (84,750) | 2,904 | (2,904) | (84,750) | (84,750) | |||||||||
| Stock redeemed or called during period, shares | (3,390,000) | ||||||||||||||
| Share-based compensation (shares) | 164,404 | ||||||||||||||
| Share-based compensation | 3,848 | 1 | 3,847 | 3,848 | 3,848 | ||||||||||
| Restricted common share redemptions | (68,762) | (68,762) | |||||||||||||
| Restricted common share redemptions | (1,784) | (1,784) | (1,784) | (1,784) | |||||||||||
| Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | (2,495) | 2,495 | |||||||||||||
| Comprehensive income | 20,211 | 9,655 | 9,066 | 1,490 | 20,211 | (1,586) | 9,471 | 1,005 | 330 | 10,991 | |||||
| Dividends | (58,188) | (58,188) | (60,610) | (49,289) | (330) | (10,991) | |||||||||
| Distributions to owners of common and preferred units | (2,422) | (2,422) | |||||||||||||
| Distributions to noncontrolling interests | (8) | (8) | (8) | (8) | |||||||||||
| Contributions from noncontrolling interests | 85 | 85 | 85 | 85 | |||||||||||
| Adjustment to arrive at fair value of noncontrolling interest | (5,631) | (5,631) | (5,631) | (5,631) | |||||||||||
| Increase in tax benefit from share-based compensation | (122) | (122) | (122) | (122) | |||||||||||
| Balance at Jun. 30, 2013 | $ 1,426,287 | $ 249,083 | $ 858 | $ 1,772,470 | $ (668,892) | $ 3,631 | $ 69,137 | $ 1,426,287 | $ 1,153,376 | $ 3,763 | $ 11,265 | $ 8,800 | $ 249,083 | ||
| Balance (in shares) at Jun. 30, 2013 | 85,845,403 | 89,633,926 | 3,788,523 | 85,845,403 | |||||||||||
| Balance (preferred units) at Jun. 30, 2013 | 352,000 | 352,000 | 9,431,667 | 9,431,667 |