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Post Retirement Benefits - Change in Benefit Obligation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Change in benefit obligation:    
Interest cost $ 332 $ 364
Postretirement benefits
    
Change in benefit obligation:    
Benefit obligation at beginning of year 9,987 9,582
Interest cost 332 364
Unrecognized (gain) loss 2,917 792
Benefits paid (628) (751)
Benefit obligation at beginning of year 6,774 9,987
Plan Assets 0 0
Amounts recorded in accumulated other comprehensive income:    
Prior service credit (8,586) (9,082)
Net loss 1,477 4,595
Total $ (7,109) $ (4,487)
Weighted-average assumptions:    
Discount rate used to determine benefit obligation and net periodic benefit cost 4.60% 3.60%