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Defined Benefit Plans - Net Periodic Pension and Postretirement Benefit Costs (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Pension Plans, Defined Benefit [Member]
        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service costs $ 150 $ 160 $ 300 $ 320
Interest costs 400 400 800 800
Expected return on plan assets (420) (410) (850) (810)
Amortization of prior service cost 10 10 10 10
Amortization of net (gain)/loss 260 170 530 350
Net periodic benefit cost 400 330 790 670
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 10 10 20 20
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (60) (60) (130) (130)
Amortization of net (gain)/loss (20) (20) (40) (40)
Net periodic benefit cost $ (70) $ (70) $ (150) $ (150)