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Leases - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings $ 1,249,809 $ 1,700,912  
Rental expense     $ 360,000
Discontinued Operations      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Rental expense     $ 2,000
Discontinued Operations      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating cash flows from operating leases $ 780 $ 787