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Consolidated Statements of Comprehensive Income Parenthetical (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Statement of Comprehensive Income [Abstract]        
Amortization of actuarial (gain) loss, tax $ (2) $ 890 $ (6) $ 2,621
Amortization of prior service costs, tax $ 0 $ 9 $ 0 $ 26