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Debt - January 2022 and March 2023 Notes (Details) - USD ($)
6 Months Ended
Mar. 15, 2020
Feb. 06, 2020
Jan. 29, 2020
Jan. 24, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Mar. 18, 2015
Jan. 23, 2014
Debt Instrument [Line Items]                  
Outstanding debt         $ 1,258,164,000   $ 1,170,417,000    
Repayments of senior debt         808,855,000 $ 0      
Gain (loss) on extinguishment of debt         (13,320,000) $ 0      
Senior Notes | January 2022 Notes                  
Debt Instrument [Line Items]                  
Face amount of debt                 $ 450,000,000.0
Interest rate (as a percent)                 5.625%
Outstanding debt       $ 428,900,000 0   447,966,000    
Repayments of senior debt     $ 21,100,000 $ 431,600,000          
Debt call price (as a percent)     100.00%            
Senior Notes | March 2023 Notes                  
Debt Instrument [Line Items]                  
Face amount of debt               $ 350,000,000.0  
Interest rate (as a percent)               6.25%  
Outstanding debt   $ 299,400,000     $ 0   $ 347,451,000    
Repayments of senior debt $ 50,600,000 $ 304,100,000              
Debt call price (as a percent) 101.563%