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Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Oct. 31, 2011
Interest Rate Swap [Member]
Oct. 31, 2009
Interest Rate Swap [Member]
Dec. 31, 2010
Cash Flow Hedging [Member]
Dec. 31, 2011
Standby Letters Of Credit [Member]
Dec. 31, 2010
Standby Letters Of Credit [Member]
Financial Instruments [Line Items]                
Notional amount       $ 10,000 $ 10,000      
Variable rate       30-day LIBOR 30-day LIBOR      
Fixed interest rate       5.07% 5.04%      
Negative fair value of derivative financial instrument   399            
Accumulated other comprehensive loss   238            
Deferred tax benefits           146    
Reclassification reflected from net change in other comprehensive loss 244 301 527          
Derivative financial instruments income tax benefit 155 185 320          
Contingent liability             3,006 3,399
Standby letters of credit and performance bonds contingently liable for 5,400              
Estimated fair value             $ 0