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Pension Plans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Service cost - benefits earned during the period $ 153 $ 453 $ 153 $ 1,685
Interest cost 305 387 1,118 1,344
Expected return on plan assets (571) (492) (1,730) (1,477)
Amortization of transition obligation          2
Amortization of net (gain)/loss 15 54 34 491
Amortization of prior service cost    8    23
Net periodic pension cost (98) 410 (425) 2,068
Pension Plan
        
Service cost - benefits earned during the period    386    1,449
Interest cost 287 326 966 1,125
Expected return on plan assets (571) (492) (1,730) (1,477)
Amortization of transition obligation          2
Amortization of net (gain)/loss 15 71 34 474
Amortization of prior service cost    3    9
Net periodic pension cost (269) 294 (730) 1,582
SERP
        
Service cost - benefits earned during the period 153 67 153 236
Interest cost 18 61 152 219
Expected return on plan assets            
Amortization of transition obligation            
Amortization of net (gain)/loss    (17)    17
Amortization of prior service cost    5    14
Net periodic pension cost $ 171 $ 116 $ 305 $ 486