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Schedule III - Real Estate and Accumulated Depreciation - Summarized Activity for Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Balance at beginning of period $ 881,251 $ 770,779 $ 761,754
Acquisition of real estate 166,630 92,310
Additions during period 22,725 18,162 9,025
Writeoff of fully depreciated assets
Balance at end of year 1,070,606 881,251 770,779
Balance at beginning of period 58,174 44,672 33,010
Depreciation expense 15,540 13,502 11,662
Writeoff of fully depreciated assets
Balance at end of year $ 73,714 $ 58,174 $ 44,672