Statement of Comprehensive Income Other Comprehensive Income, Deferred Tax (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other Comprehensive Income, Deferred Tax [Abstract]
Net actuarial loss included in net periodic benefit expense or income, tax	$ 756	$ 1,859	$ 1,550	$ 3,781
Amortization of prior service cost or credit included in net periodic benefit expense or income, tax	$ 120	$ 61	$ 242	$ 122