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Intangibles - Intangibles Lease Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Intangibles    
Gross intangible lease liabilities $ 112,489 $ 126,212
Accumulated depreciation and amortization (62,513) (73,633)
Intangible liabilities, net $ 49,976 $ 52,579