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Senior Notes (Details) - USD ($)
3 Months Ended
May 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Debt Instrument [Line Items]        
Repayments of Long-term Lines of Credit   $ 16,200,000 $ 11,500,000  
Amortization of debt discount on senior notes   120,000 0  
Amortization of Debt Issuance Costs   94,000 $ 208,000  
Senior Notes [Member]        
Debt Instrument [Line Items]        
Repayments of Long-term Lines of Credit $ 291,400,000      
Debt Issuance Costs, Gross   $ 1,400,000    
Stated interest rate percentage   6.625%    
Debt Instrument, Term   86 months    
Debt Instrument, Interest Rate During Period   6.69%    
Principal amount   $ 325,000,000   $ 325,000,000
Proceeds from the issuance of the 6.625% senior notes $ 320,100,000      
Long-term Debt, Fair Value   $ 332,400,000    
Debt Instrument, Discount Rate 1.50% 6.87%    
Debt Instrument, Unamortized Discount   $ 4,900,000    
Interest Expense, Debt   5,400,000    
Amortization of debt discount on senior notes   120,000    
Amortization of Debt Issuance Costs   $ 34,000