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Debt - 6.250% Senior Unsecured Notes Due 2024 (Details) - USD ($)
12 Months Ended
Aug. 19, 2016
May 27, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]          
Premium on senior unsecured notes     $ 2,280,000 $ 2,796,000  
Cash paid for interest     $ 129,387,000 $ 127,668,000 $ 63,170,000
6.250% senior unsecured notes due 2024          
Debt Instrument [Line Items]          
Stated interest rate     6.25%    
Senior Notes | 6.250% senior unsecured notes due 2024          
Debt Instrument [Line Items]          
Gross proceeds from note issuance $ 200,000,000.0 $ 200,000,000.0      
Stated interest rate 6.25% 6.25% 6.25%    
Net proceeds from note issuance $ 206,800,000        
Proceeds from debt issuance, net $ 199,600,000 $ 195,400,000      
Offering price percentage of par 102.00%        
Premium on senior unsecured notes $ 4,000,000.0        
Cash paid for interest $ 2,800,000        
Maximum percent of aggregate principal amount redeemable     35.00%    
Redemption price, expressed as percentage of principal amount     106.25%    
Number of days within closing date redemption can occur     120 days    
Minimum required principal amount to remain outstanding subsequent to redemption     65.00%    
Senior Notes | 6.250% senior unsecured notes due 2024 | Period Prior to June 1, 2019          
Debt Instrument [Line Items]          
Redemption price, expressed as percentage of principal amount     100.00%    
Senior Notes | 6.250% senior unsecured notes due 2024 | Debt Instrument, Redemption, Period One          
Debt Instrument [Line Items]          
Redemption price, expressed as percentage of principal amount     104.688%    
Senior Notes | 6.250% senior unsecured notes due 2024 | 12-month period beginning June 1, 2020          
Debt Instrument [Line Items]          
Redemption price, expressed as percentage of principal amount     103.125%    
Senior Notes | 6.250% senior unsecured notes due 2024 | 12-month period beginning June 1, 2021          
Debt Instrument [Line Items]          
Redemption price, expressed as percentage of principal amount     101.563%    
Senior Notes | 6.250% senior unsecured notes due 2024 | 12-month period beginning June 1, 2022          
Debt Instrument [Line Items]          
Redemption price, expressed as percentage of principal amount     100.00%