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Long-Term Debt - Former Credit Facility (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Line of Credit Facility        
Repayments of long-term debt   $ 1,204,375 $ 2,071,750 $ 605,636
Debt extinguishment loss   $ 3,971 $ 3,653 $ 2,450
Former Credit Facility        
Line of Credit Facility        
Repayments of long-term debt $ 63,200      
Letter of credit outstanding 15,400      
Debt extinguishment loss $ 2,500