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Senior Notes (Details) - USD ($)
3 Months Ended 9 Months Ended
May 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]            
Repayments of Long-term Lines of Credit       $ 37,300,000 $ 188,000,000  
Proceeds from the issuance of the 6.625% senior notes       0 320,125,000  
Accretion of debt discount on senior notes       366,000 154,000  
Amortization of Debt Issuance Costs       289,000 $ 420,000  
Senior Notes [Member]            
Debt Instrument [Line Items]            
Repayments of Long-term Lines of Credit $ 291,400,000          
Debt Issuance Costs, Gross   $ 1,400,000   $ 1,400,000    
Stated interest rate percentage   6.625%   6.625%    
Debt Instrument, Term       80 months    
Debt Instrument, Interest Rate During Period   6.69%   6.69% 6.69%  
Principal amount   $ 325,000,000   $ 325,000,000   $ 325,000,000
Proceeds from the issuance of the 6.625% senior notes $ 320,100,000          
Long-term Debt, Fair Value   $ 334,000,000   $ 334,000,000    
Debt Instrument, Discount Rate 1.50% 6.87%   6.87% 6.87%  
Debt Instrument, Unamortized Discount   $ 4,900,000   $ 4,900,000    
Interest Expense, Debt   5,400,000 $ 5,400,000 16,100,000 $ 7,200,000  
Accretion of debt discount on senior notes   124,000 116,000 366,000 154,000  
Amortization of Debt Issuance Costs   $ 35,000 $ 33,000 $ 103,000 $ 44,000