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Schedule III - Real Estate and Accumulated Depreciation - Summary of Activity for Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Real estate:      
Balances at beginning of year $ 14,330,257 $ 12,931,832 $ 12,592,841
Acquisition of real estate and development and improvements 987,135 1,930,931 756,043
Disposition of real estate (577,799) (121,374) (169,311)
Impairments   (3,118)  
Balances associated with changes in reporting presentation (764,833) (408,014) (247,741)
Balances at end of year 13,974,760 14,330,257 12,931,832
Accumulated depreciation:      
Balances at beginning of year 2,476,015 2,190,486 1,965,592
Depreciation expense 465,945 418,591 384,019
Disposition of real estate (109,949) (17,251) (55,745)
Balances associated with changes in reporting presentation (183,081) (115,811) (103,380)
Balances at end of year $ 2,648,930 $ 2,476,015 $ 2,190,486