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Intangibles - Intangibles Lease Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Intangibles    
Gross intangible lease assets $ 491,998 $ 556,114
Accumulated depreciation and amortization (216,433) (251,035)
Intangible assets, net $ 275,565 $ 305,079