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Debt and Leases - Interest Rate Swaps (Details) - USD ($)
 12 Months Ended
Mar. 31, 2009
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Interest rate swaps:        
Interest expense for settlements related to swaps   $ 2,000 $ 32,000 $ 70,000
ERROR in label resolution. | 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, was 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   $ 0 $ 2,000  
Interest income (loss) for mark-to-market adjustment of swap fair value   (2,000) 35,000 $ 66,000
Derivative, Notional Amount   0 $ 714,000  
Debt instrument, face amount   $ 12,000,000