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Intangibles - Intangibles Lease Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Intangibles    
Gross intangible lease liabilities $ 143,209 $ 163,924
Accumulated depreciation and amortization (91,746) (105,779)
Net intangible lease liabilities $ 51,463 $ 58,145