Statement of Comprehensive Income Other Comprehensive Income, Deferred Tax (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other Comprehensive Income (Loss), Tax, Parenthetical Disclosures [Abstract]
Net actuarial loss included in net periodic benefit expense or income, tax	$ 925	$ 1,892	$ 2,475	$ 5,672
Amortization of prior service cost or credit included in net periodic benefit expense or income, tax	$ 120	$ 61	$ 362	$ 184