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Consolidated Statements of Comprehensive Income Parenthetical (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement of Comprehensive Income [Abstract]        
Amortization of actuarial loss, tax $ 870 $ 0 $ 1,731 $ 0
Amortization of prior service cost and other, tax $ 8 $ 0 $ 17 $ 0