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Fair Value Measurements - Fair Values for Financial Instruments Carried At Cost (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
May 28, 2019
Dec. 31, 2018
Mar. 10, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying value of debt $ 1,191,207   $ 861,539  
Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying value of debt $ 842,216   348,054  
Senior Notes | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate 4.50%     4.50%
Carrying value of debt $ 348,616   348,054  
Fair value of debt $ 362,500      
Senior Notes | Senior Notes Due 2029        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate 4.95% 4.95%    
Carrying value of debt $ 493,600   $ 0  
Fair value of debt $ 537,400