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Debt - $350 Million 5% Senior Notes (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2019
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 03, 2013
Debt Instrument [Line Items]            
Loss on extinguishment of debt     $ (494,000)      
Unamortized deferred financing costs     3,079,000 $ 1,956,000 $ 925,000  
Senior Notes [Member] | $350 Million 5% Senior Notes [Member]            
Debt Instrument [Line Items]            
Face amount   $ 350,000,000 $ 350,000,000     $ 350,000,000.0
Stated interest rate (as a percent)   5.00% 5.00%     5.00%
Redemption price of per thousand   $ 1,002.50        
Aggregate tendered amount   197,500,000        
Loss on extinguishment of debt   (500,000)        
Unamortized deferred financing costs   1,700,000        
Senior Notes [Member] | $500 Million 4.75% Senior Notes            
Debt Instrument [Line Items]            
Face amount $ 500,000,000 $ 500,000,000.0        
Stated interest rate (as a percent) 4.75% 4.75%        
Senior Notes [Member] | $700 Million 4.75% Senior Note [Member]            
Debt Instrument [Line Items]            
Face amount $ 700,000,000 $ 700,000,000 $ 700,000,000      
Stated interest rate (as a percent) 4.75% 4.75% 4.75%      
Redemption price (as a percent) 100.00%          
Redemption date Oct. 15, 2022          
Senior Notes [Member] | $700 Million 4.75% Senior Note [Member] | 2022            
Debt Instrument [Line Items]            
Redemption price (as a percent) 103.563%          
Senior Notes [Member] | $700 Million 4.75% Senior Note [Member] | 2023            
Debt Instrument [Line Items]            
Redemption price (as a percent) 102.375%