Quarterly report pursuant to Section 13 or 15(d)

Discontinued Operations and Assets Held for Sale (Details)

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Discontinued Operations and Assets Held for Sale (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Assets Held-for-sale
Dec. 31, 2012
Assets Held-for-sale
Jan. 30, 2012
White Marsh Portfolio Disposition Property
Property
Jul. 24, 2012
July 2012 Portfolio Disposition
Property
Jun. 30, 2013
Colorado Springs
Assets Held-for-sale
Property
Properties                    
Number of properties sold               5 23  
Number of operating properties classified as held for sale                   16
Revenue from real estate operations $ 5,546 $ 13,299 $ 11,265 $ 28,403            
Property operating expenses (1,246) (4,607) (2,793) (9,966)            
Depreciation and amortization (69) (3,371) (158) (6,724)            
Impairment losses (7,195) (2,354) (9,052) (13,777)            
General, administrative and leasing expenses 0 (2) (1) (2)            
Business development and land carry costs 0 (6) 0 (24)            
Interest expense (67) (736) (131) (1,980)            
Gain on sales of real estate 0 (103) 0 4,035            
Loss on early extinguishment of debt 0 (2) 0 (2)            
Discontinued operations (3,031) 2,118 (870) (37)            
Properties, net 3,211,304   3,211,304   3,163,044 124,299 128,740      
Deferred rent receivable 89,811   89,811   85,802 4,763 4,068      
Intangible assets on real estate acquisitions, net 68,046   68,046   75,879 4,392 4,409      
Deferred leasing, net           3,359 2,923      
Lease incentives 9,144   9,144   5,578 83 89      
Assets held for sale $ 136,896   $ 136,896   $ 140,229 $ 136,896 $ 140,229