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Summary of Significant Accounting Policies - Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Jan. 01, 2018
Dec. 31, 2017
Accounting Standards Update 2017-12      
Change in Accounting Principle      
Cumulative effect reduction to the opening balance of retained earnings     $ (116)
Accounting Standards Update 2017-12 | Retained Earnings      
Change in Accounting Principle      
Cumulative effect reduction to the opening balance of retained earnings   $ (116) $ (116)
Scenario, Forecast      
Change in Accounting Principle      
Right-of use assets $ 91,900    
Lease liabilities $ 112,800