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Intangibles - Intangibles Lease Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Intangibles    
Gross intangible lease liabilities $ 124,609 $ 126,212
Accumulated depreciation and amortization (72,033) (73,633)
Intangible liabilities, net $ 52,576 $ 52,579