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Debt - Schedule of Long-Term Debt (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Feb. 28, 2018
Nov. 30, 2014
Debt Instrument [Line Items]          
Document Period End Date Sep. 30, 2020        
Fair value of interest rate swaps $ 0        
Fair Value Hedge Liabilities     $ 3,235,000    
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge 11,525,000        
Interest rate swap principal 200,000,000 $ 200,000,000 200,000,000    
Unamortized debt issuance costs (5,894,000)   (6,719,000)    
Revolving Credit Facility 0   0    
Long-term Debt $ 805,631,000   $ 796,516,000    
Senior Notes due 2024 [Member]          
Debt Instrument [Line Items]          
Interest rate, stated percentage 4.65%   4.65%   4.65%
Senior notes $ 500,000,000   $ 500,000,000   $ 500,000,000
Senior Notes due 2028 [Member]          
Debt Instrument [Line Items]          
Interest rate, stated percentage 6.00%   6.00% 6.00%  
Senior notes $ 300,000,000   $ 300,000,000 $ 300,000,000