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Consolidated Statements of Comprehensive Income Parenthetical (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Amortization of actuarial loss, tax $ 890 $ 0 $ 2,621 $ 0
Amortization of prior service cost and other, tax $ 9 $ 0 $ 26 $ 0