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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net income $ 80,836 $ 1,668
Defined benefit pension plans    
Amortization of actuarial loss, net of tax of $861 and $0, respectively 1,395 2,026
Amortization of prior service costs and other, net of tax of $9 and $0, respectively 14 41
Other comprehensive income, net of tax 1,409 [1] 2,067 [1]
Comprehensive income (loss) $ 82,245 $ 3,735
[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.