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Schedule III - Real Estate and Accumulated Depreciation (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investment in Real Estate:      
Beginning balance $ 1,315,621 $ 1,179,345 $ 925,507
Additions 24,280 146,828 265,484
Write-offs (11,977) (8,609) (11,646)
Sales/Disposals (69,512) (1,943) 0
Ending balance 1,258,412 1,315,621 1,179,345
Accumulated Depreciation:      
Beginning balance 224,142 189,042 160,181
Depreciation expense 45,716 43,780 40,507
Write-offs (11,977) (8,609) (11,646)
Sales/Disposals (14,001) (71) 0
Ending balance 243,880 224,142 189,042
Investment in Real Estate, net $ 1,014,532 $ 1,091,479 $ 990,303