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Summary of Significant Accounting Policies - Schedule Of Other Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Net Carrying Amount $ 1,467,025 $ 1,506,522
Other finite-lived intangible assets (included in Other, a component of other assets, net)    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 19,960 20,310
Accumulated Amortization (16,482) (14,798)
Net Carrying Amount $ 3,478 $ 5,512