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Intangibles - Intangibles Lease Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Intangibles    
Gross intangible lease liabilities $ 88,892 $ 94,444
Accumulated depreciation and amortization (35,121) (39,781)
Intangible liabilities, net $ 53,771 $ 54,663