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Schedule III - Real Estate and Accumulated Depreciation (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investment in Real Estate:      
Beginning balance $ 1,258,412 $ 1,315,621 $ 1,179,345
Additions 287,871 24,280 146,828
Write-offs (6,935) (11,977) (8,609)
Impairment (25,391) 0 0
Sales/Disposals (110,847) (69,512) (1,943)
Ending balance 1,403,110 1,258,412 1,315,621
Accumulated Depreciation:      
Beginning balance 243,880 224,142 189,042
Depreciation expense 52,135 45,716 43,780
Impairment 0 0 0
Write-offs (6,935) (11,977) (8,609)
Sales/Disposals (31,812) (14,001) (71)
Ending balance 257,268 243,880 224,142
Investment in Real Estate, net $ 1,145,842 $ 1,014,532 $ 1,091,479