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Pension Plans and Other Postretirement Benefits (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Defined Benefit Plan [Member]
    
Service cost:    
Benefit accrual $ 0 $ 0
Other expenses 90 90
Interest cost 420 342
Expected return on plan assets (601) (560)
Settlement loss 189 258
Amortization of:    
Prior service cost 0 0
Actuarial loss 343 401
Net periodic pension expense 441 531
Supplemental Defined Benefit Plans [Member]
    
Service cost:    
Benefit accrual 0 0
Other expenses 0 0
Interest cost 179 154
Expected return on plan assets 0 0
Settlement loss 0 0
Amortization of:    
Prior service cost 0 31
Actuarial loss 39 51
Net periodic pension expense $ 218 $ 236