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Post Retirement Benefits - Change in Benefit Obligation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Change in benefit obligation:      
Interest cost $ 364 $ 531  
Postretirement benefits
      
Change in benefit obligation:      
Benefit obligation at beginning of year 9,582 10,837  
Interest cost 364 531  
Unrecognized (gain) loss 792 (1,260) (1,260)
Benefits paid (751) (526)  
Benefit obligation at beginning of year 9,987 9,582 10,837
Plan Assets 0 0  
Amounts recorded in accumulated other comprehensive income:      
Prior service credit (9,082) (9,579)  
Net loss 4,595 3,963  
Total $ (4,487) $ (5,616)  
Weighted-average assumptions:      
Discount rate used to determine benefit obligation and net periodic benefit cost 3.60% 4.10%