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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net (loss) gain arising during the period, tax benefit (provision) $ (32,346) $ (6,359) $ (15,830)
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Tax 298 188 (1,163)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit), Tax (1,976) (2,079) 0
Amortization of actuarial loss included in net periodic cost, tax expense (5,742) 4,761 3,513
Amortization of prior service credit included in net periodic cost, tax benefit $ 64 $ 806 $ (252)