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Components of Net Periodic Pension Benefit Cost (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
Net pension cost of plans        
Service cost $ 117 $ 114 $ 233 $ 229
Interest cost 1,960 2,030 3,920 4,059
Expected return on plan assets (1,683) (1,756) (3,366) (3,511)
Amortization of prior service cost 1 12 2 24
Recognized actuarial loss 1,500 1,130 3,000 2,259
Net periodic benefit cost $ 1,895 $ 1,530 $ 3,789 $ 3,060