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6. Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Apr. 15, 2019
Dec. 31, 2018
Dec. 31, 2010
Debt Instrument [Line Items]        
Debt, Long-term and Short-term, Combined Amount $ 439,400      
Debt and Capital Lease Obligations     $ 439,400  
Other Long-term Debt, Current 1,800      
Less Current Maturities     (500)  
Long-term debt, net of current maturities 437,606   438,937  
Unsecured Debt [Member] | Senior Notes 4.875% due 2020 [Member]        
Debt Instrument [Line Items]        
Unsecured Debt 425,000   425,000  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 1,100   1,300  
Debt Instrument, Interest Rate, Stated Percentage       4.875%
Debt Instrument, Redemption Price, Percentage 100.00%      
Long-term debt $ 423,900   423,700 $ 422,600
Debt Instrument, Interest Rate, Effective Percentage       4.946%
Face amount of debt sold       $ 425,000
Capital Lease Obligations [Member] | Capital Leases and Other Debt [Member]        
Debt Instrument [Line Items]        
Long-term Debt and Capital Lease Obligations, Including Current Maturities 0   15,700  
Finance Lease Obligations [Member] | Capital Leases and Other Debt [Member]        
Debt Instrument [Line Items]        
Other Long-term Debt     $ 0  
Finance Lease Obligations [Member] | Finance Leases and Other Debt [Member]        
Debt Instrument [Line Items]        
Other Long-term Debt 15,500      
Line of Credit [Member]        
Debt Instrument [Line Items]        
Line of credit maximum borrowing capacity 200,000      
Outstanding borrowings $ 0      
Line of Credit Facility, Interest Rate at Period End 3.725%      
Standby Letters of Credit [Member]        
Debt Instrument [Line Items]        
Line of credit maximum borrowing capacity $ 200      
Scenario, Forecast [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Line of credit maximum borrowing capacity   $ 200,000