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Equity Level 4 Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Abstract]              
Beginning Balance $ (119,820) $ (118,778) $ (121,229) $ (120,845) $ (120,845) $ (40,195)  
Defined benefit plans, amounts reclassified from accumulated other comprehensive loss, net of tax 1,425 [1] 2,000 [1] 2,834 [1] 4,067 [1] (384) (80,650) (3,293)
Ending Balance $ (118,395) $ (116,778) $ (118,395) $ (116,778) $ (121,229) $ (120,845) $ (40,195)
[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 6, Retirement and Benefit Plans.