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Senior Notes (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Debt Instrument [Line Items]      
Repayments of Long-term Lines of Credit $ 33,000,000 $ 16,200,000  
Accretion of debt discount, net of debt premium on senior notes 75,000 120,000  
Amortization of Debt Issuance Costs $ 200,000 $ 94,000  
Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Term   74 months  
Debt Instrument, Interest Rate During Period 6.69% 6.69%  
Principal amount $ 400,000,000   $ 400,000,000
Long-term Debt, Fair Value $ 432,300,000    
Debt Instrument, Discount Rate 6.87% 6.87%  
Interest Expense, Debt $ 6,600,000 $ 5,400,000  
Amortization of Debt Issuance Costs $ 67,000 34,000  
Senior Notes [Member] | Senior Note One [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate During Period 6.69%    
Debt Instrument, Discount Rate 6.87%    
Accretion of debt discount, net of debt premium on senior notes $ 129,000 $ 120,000  
Senior Notes [Member] | Senior Note Two [Member]      
Debt Instrument [Line Items]      
Stated interest rate percentage 6.625%    
Debt Instrument, Interest Rate During Period 6.88%    
Debt Instrument, Discount Rate 6.20%    
Accretion of debt discount, net of debt premium on senior notes $ (54,000)