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Defined Benefit Plans - Net Periodic Pension and Postretirement Benefit Costs (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Pension Plans, Defined Benefit [Member]
        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service costs $ 150 $ 160 $ 450 $ 480
Interest costs 410 400 1,210 1,200
Expected return on plan assets (430) (400) (1,280) (1,210)
Amortization of prior service cost 0 0 10 10
Settlement/curtailment (gain) 0 0 0 0
Amortization of net (gain)/loss 260 180 790 530
Net periodic benefit cost 390 340 1,180 1,010
Other Postretirement Benefit Plans, Defined Benefit [Member]
        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service costs 0 0 0 0
Interest costs 20 10 40 30
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (70) (70) (200) (200)
Settlement/curtailment (gain) (1,490) 0 (1,490) 0
Amortization of net (gain)/loss (20) (20) (60) (60)
Net periodic benefit cost $ (1,560) $ (80) $ (1,710) $ (230)