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Intangibles - Intangibles Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Intangibles    
Gross intangible lease liabilities $ 91,896 $ 94,444
Accumulated depreciation and amortization (36,983) (39,781)
Intangible liabilities, net $ 54,913 $ 54,663