Annual report pursuant to Section 13 and 15(d)

Schedule III - Reconciliation of Real Estate Property (Details)

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Schedule III - Reconciliation of Real Estate Property (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance, beginning of year $ 2,965,907 $ 2,513,217 $ 2,263,603
Acquisitions 0 335,710 0
Improvements 175,868 163,187 245,391
Dispositions and reclassifications to and from rental property held for sale (53,305) (46,207) 4,223
Balance, end of year $ 3,088,470 $ 2,965,907 $ 2,513,217