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Debt Narrative (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
Apr. 18, 2017
USD ($)
Line of Credit Facility      
Weighted average interest rate at end of period 5.36%    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 12,066,000    
Letters of Credit Outstanding, Amount 3,279,000    
Commitment fees on unused lines of credit $ 595,000    
Debt, Weighted Average Interest Rate, net of Currency Swap Contract 4.46%    
Line of Credit      
Line of Credit Facility      
Outstanding Borrowings $ 22,000,000    
Line of Credit | JPMorgan, 2017 Credit Agreement      
Line of Credit Facility      
Face amount     $ 300,000,000
Debt Instrument, Notes Repurchase Price As Percentage Of Principal Amount In Changes Of Control 101.00%    
Debt Instrument, Notes Repurchase Price As Percentage Of Principal Amount When Not Use Asset Sales Proceeds For Specific Purposes 100.00%    
Revolving Credit Facility      
Line of Credit Facility      
Outstanding Borrowings $ 31,000,000    
Line of Credit Facility, Remaining Borrowing Capacity 165,721,000    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 6,875,000    
Long-term Debt, Additional Repayments of Principal in Next Twelve Months 15,125,000    
Long-term Debt, Current Maturities $ 22,000,000    
Revolving Credit Facility | JPMorgan, 2017 Credit Agreement      
Line of Credit Facility      
Debt Instrument, Covenant, Indebtedness to Adjusted EBITDA Ratio, Maximum   4.00  
Debt Instrument, Covenant, Adjusted EBITDA to Interest Expense Ratio, Maximum   3.50  
Debt Instrument, Covenant, Senior Secured Net Indebtedness to Adjusted EBITDA Ratio, Maximum   3.50  
Debt Instrument, Covenant, Net Leverage Ratio, Minimum   3.00  
Bonds      
Line of Credit Facility      
Face amount     $ 300,000,000
Interest rate, Stated percentage 5.625%   5.625%
Minimum | Revolving Credit Facility | JPMorgan, 2017 Credit Agreement      
Line of Credit Facility      
Debt Instrument, Covenant, Repayment of Debt, Percentage of Excess Cash Flow   25.00%  
Maximum | Revolving Credit Facility | JPMorgan, 2017 Credit Agreement      
Line of Credit Facility      
Debt Instrument, Covenant, Repayment of Debt, Percentage of Excess Cash Flow   50.00%