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
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Changes in cost of properties      
Beginning balance $ 3,874,715 $ 4,158,616 $ 4,014,336
Acquisitions of operating properties 0 0 194,616
Improvements and other additions 259,548 251,960 273,761
Sales (138,216) (268,038) (172,628)
Impairments (15,116) (143,502) (29,548)
Other dispositions (118) (124,321) (121,921)
Ending balance 3,980,813 3,874,715 4,158,616
Changes in accumulated depreciation      
Beginning balance 715,951 718,680 703,083
Depreciation expense 107,772 105,763 112,695
Sales (22,567) (56,607) (49,614)
Impairments 0 (42,161) (6,092)
Other dispositions (118) (9,724) (41,392)
Ending balance $ 801,038 $ 715,951 $ 718,680