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Senior Notes (Details) - USD ($)
 3 Months Ended 9 Months Ended
May 31, 2018
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Debt Instrument [Line Items]        
Repayments of Long-term Lines of Credit     $ 188,000,000 $ 67,300,000
Debt Issuance Costs, Gross   $ 900,000 900,000  
Proceeds from the issuance of the 6.625% senior notes     320,125,000 0
Interest Expense, Debt     7,200,000  
Amortization of debt discount on senior notes     154,000 0
Amortization of Debt Issuance Costs     420,000 $ 614,000
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     92 months  
Debt Instrument, Interest Rate During Period   6.87% 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   331,900,000 331,900,000  
Debt Instrument, Discount Rate 1.50%      
Debt Instrument, Unamortized Discount   4,900,000 4,900,000  
Interest Expense, Debt   5,400,000 7,200,000  
Amortization of debt discount on senior notes   116,000 154,000  
Amortization of Debt Issuance Costs   $ 33,000 $ 44,000