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Debt and Leases - Interest Rate Swaps (Details) - USD ($)
 12 Months Ended
Dec. 31, 2009
Mar. 31, 2009
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Interest rate swaps:            
Interest expense for settlements related to swaps     $ 32,000 $ 70,000 $ 110,000  
Industrial Development Revenue Bond swap agreement | Interest rate swap | Cash flow hedging | Designated as hedging instrument            
Interest rate swaps:            
Derivative, fixed interest rate       4.89%    
Debt Instrument, Description of Variable Rate Basis 30-day commercial paper rate          
Percentage of variable rate receivable 76.00%          
Derivative, variable interest rate           0.10%
Description of reclassification of cash flow hedge gain (loss)       The pre-tax loss previously recognized in Accumulated Other Comprehensive Income (Loss), totaling $200,000 as of December 31, 2009, was 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.    
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income $ 200,000          
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income, monthly amortization amount 5,000          
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income, monthly amortization amount, net of tax $ 3,000          
Capex loan swap agreement | Interest rate swap | Cash flow hedging | Designated as hedging instrument            
Interest rate swaps:            
Derivative, fixed interest rate     2.295%      
Debt Instrument, Description of Variable Rate Basis     LIBOR      
Derivative, variable interest rate       0.44%    
Description of reclassification of cash flow hedge gain (loss)     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   $ 146,000        
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income, monthly amortization amount   2,000        
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income, monthly amortization amount, net of tax   $ 1,000        
Derivatives not designated as hedging instruments, interest rate swap liabilities     $ 2,000 $ 37,000    
Interest income (loss) for mark-to-market adjustment of swap fair value     (35,000) 66,000 $ 102,000  
Derivative, Notional Amount     714,000 $ 2,428,000    
Debt instrument, face amount     $ 12,000,000