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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net income $ 10,412 $ 15,047 $ 91,248 $ 16,715
Defined benefit pension plans        
Amortization of actuarial loss, net of tax of $870, $0, $1,731, and $0, respectively 1,411 1,958 2,806 3,984
Amortization of prior service costs and other, net of tax of $8, $0, $17, and $0, respectively 14 42 28 83
Other comprehensive income, net of tax 1,425 [1] 2,000 [1] 2,834 [1] 4,067 [1]
Comprehensive income (loss) $ 11,837 $ 17,047 $ 94,082 $ 20,782
[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.