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Pension Plans (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Amount recognized in accumulated other comprehensive loss related to pension plan        
Beginning Balance   $ (8,000) $ (4,431)  
Reclassification adjustments:        
Pretax amortized net actuarial loss   750 412 280
Tax provision   (284) (156) (106)
Net of reclassification adjustments   466 256 174
Adjustment to recognize (loss) gain on unfunded pension obligations:        
Pretax (loss) gain   (4,297) (6,156)  
Tax (benefit)   1,627 2,331 (96)
Net of tax adjustment to recognize (loss) gain on unfunded pension obligations   (2,670) (3,825) 157
Adjustment to recognized the gain on curtailment of the pension plan:        
Pretax curtailment gain 6,300 6,275 0  
Tax provision   (2,376) 0  
Net of tax adjustment to recognize the gain on curtailment of the pension plan   3,899 0 0
Ending Balance $ (6,305) $ (6,305) $ (8,000) $ (4,431)