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6. Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2010
Debt Instrument [Line Items]      
Debt and Capital Lease Obligations $ 434,800 $ 434,500  
Less Current Maturities (500) (300)  
Long-term debt, net of current maturities 434,289 434,186  
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 $ 2,400 2,500  
Debt Instrument, Interest Rate, Stated Percentage     4.875%
Debt Instrument, Redemption Price, Percentage 100.00%    
Long-term debt $ 422,600 422,500 $ 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 12,200 $ 12,000  
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 2.40%    
Standby Letters of Credit [Member]      
Debt Instrument [Line Items]      
Line of credit maximum borrowing capacity $ 800