Annual report pursuant to Section 13 and 15(d)

Schedule III - Real Estate and Accumulated Depreciation (Details 2)

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Schedule III - Real Estate and Accumulated Depreciation (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Changes in cost of properties      
Beginning balance $ 4,038,932 $ 3,948,487 $ 3,452,512
Acquisitions of operating properties 33,684 26,887 187,052
Building and land improvements 214,418 304,079 338,358
Sales (291,491) (75,315) (29,430)
Impairments (121,557) (165,206) 0
Other dispositions (13,891) 0 0
Other (135) 0 (5)
Ending balance 3,859,960 4,038,932 3,948,487
Changes in accumulated depreciation      
Beginning balance 577,601 503,032 422,612
Depreciation expense 93,158 99,173 88,048
Sales (40,346) (9,640) (7,764)
Impairments (58,855) (15,039) 0
Other dispositions (3,247) 0 0
Other (135) 75 136
Ending balance $ 568,176 $ 577,601 $ 503,032