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Intangibles - Intangibles Lease Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Intangibles    
Gross intangible lease assets $ 818,577 $ 911,697
Accumulated depreciation and amortization (404,173) (431,892)
Net intangible lease assets $ 414,404 $ 479,805