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5. Notes Payable and Long-Term Debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2010
May. 31, 2009
Debt Instrument [Line Items]          
Debt and Capital Lease Obligations   $ 436,000 $ 436,000    
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Remainder of Fiscal Year   300 300    
Long-term Debt and Capital Lease Obligations   435,707 435,710    
Debt Instrument, Interest Rate, Stated Percentage         8.00%
Gains (Losses) on Extinguishment of Debt $ (15,600)        
Maturities of Long-term Debt [Abstract]          
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months   300      
Long-term Debt, Maturities, Repayments of Principal in Year Two   300      
Long-term Debt, Maturities, Repayments of Principal in Year Three   300      
Long-term Debt, Maturities, Repayments of Principal in Year Four   200      
Long-term Debt, Maturities, Repayments of Principal in Year Five   425,300      
Long-term Debt, Maturities, Repayments of Principal after Year Five   10,900      
Line of Credit Facility, Remaining Borrowing Capacity   201,200      
Letters of Credit Outstanding, Amount   1,300      
Performance Guarantee [Member]          
Maturities of Long-term Debt [Abstract]          
Line of Credit Facility, Remaining Borrowing Capacity   2,600      
Unsecured Debt [Member] | Senior Notes 4.875% [Member]          
Debt Instrument [Line Items]          
Long-term debt   423,700 423,500 $ 422,600  
Debt Instrument, Interest Rate, Effective Percentage       4.946%  
Face amount of debt sold       $ 425,000  
Debt Instrument, Interest Rate, Stated Percentage       4.875%  
Capital Lease Obligations [Member] | Capital leases and other debt [Member]          
Debt Instrument [Line Items]          
Long-term Debt and Capital Lease Obligations, Including Current Maturities   12,300 $ 12,500    
Line of Credit [Member]          
Maturities of Long-term Debt [Abstract]          
Line of Credit Facility, Maximum Borrowing Capacity   200,000      
Line of Credit Facility, Amount Outstanding   $ 0      
Line of Credit Facility, Interest Rate at Period End   1.86%      
Standby Letters of Credit [Member]          
Maturities of Long-term Debt [Abstract]          
Line of Credit Facility, Maximum Borrowing Capacity   $ 800