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Accumulated Other Comprehensive Loss (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Accumulated Other Comprehensive Loss [Abstract]  
Beginning balance $ (23,378)
Amortization of defined benefit pension items [Abstract]  
Prior service costs 52
Actuarial loss 428
Amortization of defined benefit pension items 480
Tax (182)
Total amount reclassified from accumulated other comprehensive loss 298
Ending balance $ (23,080)