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Post Retirement Benefits (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 12 Months Ended
Aug. 19, 2010
Dec. 31, 2012
Plan
Dec. 31, 2012
Postretirement benefits
Dec. 31, 2011
Postretirement benefits
Dec. 31, 2010
Postretirement benefits
Postretirement benefits:          
Number of 401k plans   3      
Payments for post retirement benefits $ 1,257        
Decrease in post retirement obligations         10,282
Amortization period         20 years
Change in net periodic benefit cost due to plan ammendment     496 496  
Actuarial gain (loss)     792 (1,260) (1,260)
Actuarial gain (loss), net of tax     508   (808)
Prior service credit not yet recognized     4,487 5,616  
Amounts that will be amortized from accumulated other comprehensive income in necxt fiscal year:          
Amortization of prior service credit     496    
Amortization of prior service credit, net of tax     338    
Amortization of loss     201    
Amortization of loss, net of tax     129    
Amortization of interest expense     332    
Amortization of interest expense, net of tax     220    
Amounts that will be amortized in next fiscal year     37    
Amounts that will be amortized in next fiscal year, net of tax     11    
Assumed health care cost trend rates:          
Health care cost trend rate assumed for next fiscal year     7.00% 7.00%  
Ultimate health care cost trend rate     5.00% 5.00%  
Effect of changing the health care cost trend rate by one-percentage point for each future year:          
Effect on total of service and interest cost components, 1 - percentage point increase     37    
Effect on total of service and interest cost components, 1 - percentage point decrease     (48)    
Effect on post retirement benefit obligation, 1 - percentage point increase     990    
Effect on post retirement benefit obligation, 1 - percentage point decrease     $ (1,400)