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Debt and Leases - Interest Rate Swaps (Details) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Capex loan
Dec. 31, 2012
Industrial Development Revenue Bond swap agreement
Dec. 31, 2011
Industrial Development Revenue Bond swap agreement
Dec. 31, 2009
Industrial Development Revenue Bond swap agreement
Interest rate swap
Cash flow hedging
Designated as hedging instrument
Dec. 31, 2012
Capex loan swap agreement
Dec. 31, 2011
Capex loan swap agreement
Mar. 31, 2009
Capex loan swap agreement
Interest rate swap
Cash flow hedging
Designated as hedging instrument
Interest rate swaps:                  
Derivative, fixed interest rate       4.89%     2.295%    
Percentage of variable rate receivable           76.00%      
Derivative, description of variable rate basis       76% of the 30-day commercial paper rate   30-day commercial paper rate LIBOR    
Derivative, variable interest rate       0.10%     0.21%    
Description of reclassification of cash flow gedge gain (loss)       The pre-tax loss previously recognized in Accumulated Other Comprehensive Income (Loss), totaling $200,000 as of December 31, 2009, is being amortized as an increase to interest expense of $5,000 per month, or $3,000 net of tax, over the remaining term of the interest rate swap agreement.     The pre-tax loss previously recognized in Accumulated Other Comprehensive Income (Loss), totaling $146,000 as of March 31, 2009, is being amortized as an increase to interest expense of $2,000 per month, or $1,000 net of tax, over the remaining term of the interest rate swap agreement.    
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income           $ 200,000     $ 146,000
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income, monthly amortization amount           5,000     2,000
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income, monthly amortization amount, net of tax           3,000     1,000
Derivatives not designated as hedging instruments, interest rate swap liabilities       8,000 52,000   205,000 279,000  
Interest income (loss) for mark-to-market adjustment of swap fair value       44,000 74,000   74,000 (55,000)  
Notional amount of swap       420,000 1,210,000   5,857,000 7,571,000  
Debt instrument, face amount     12,000,000            
Interest expense for settlements related to swaps $ 170,000 $ 246,000