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Level 4 Accumulated Other Comprehensive Loss (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Beginning Balance $ (55,253) $ (119,820) $ (55,249) $ (121,229)
Defined benefit plans, amounts reclassified from accumulated other comprehensive loss, net of tax (4) [1] 1,425 [1] (8) [1] 2,834 [1]
Ending Balance $ (55,257) $ (118,395) $ (55,257) $ (118,395)
[1] Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 7, Retirement and Benefit Plans.