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Revenues (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Retained earnings $ 1,629,257   $ 2,179,358
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Retained earnings   $ (28,500)