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Long-Term Debt - 2028 Notes and 2027 Notes (Details)
$ in Thousands
 1 Months Ended 12 Months Ended 13 Months Ended
Dec. 17, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 17, 2020
USD ($)
Offering
Debt Instruments              
Borrowings of long-term debt       $ 1,049,000 $ 2,395,250 $ 714,830  
Proceeds from issuance of debt       1,049,000 2,395,250 714,830  
Repayments of long-term debt       1,204,375 2,071,750 605,636  
Interest paid       99,797 97,451 86,758  
Debt extinguishment loss       $ 3,971 3,653 $ 2,450  
2028 Notes              
Debt Instruments              
Debt instrument face amount $ 300,000 $ 500,000     $ 500,000   $ 300,000
Interest rate (as a percent) 6.25% 6.25%     6.25%   6.25%
Number of offerings | Offering             2
Borrowings of long-term debt $ 309,900 $ 491,800          
Percent of face value debt issued 104.875%           104.875%
Debt instrument effective interest rate (as a percent) 5.60%           5.60%
Proceeds from issuance of debt $ 309,900 491,800          
Issuance costs $ 4,700 $ 8,200     $ 8,200   $ 4,700
2027 Notes              
Debt Instruments              
Debt instrument face amount     $ 500,000        
Interest rate (as a percent)     6.875%        
Borrowings of long-term debt     $ 491,200        
Proceeds from issuance of debt     491,200        
Issuance costs     $ 8,800