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Accumulated Other Comprehensive Loss (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Accumulated Other Comprehensive Loss [Abstract]    
Beginning balance $ (23,080) $ (23,378)
Amortization of defined benefit pension items [Abstract]    
Prior service costs 52 104
Actuarial loss 428 856
Amortization of defined benefit pension items 480 960
Tax (182) (364)
Total amount reclassified from accumulated other comprehensive loss 298 596
Ending balance $ (22,782) $ (22,782)