Stockholders' Equity AOCI Reclassification (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Benefit Cost, before Tax	$ (81)	[1]
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	(485)	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(566)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	221
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ (345)

[1] These accumulated other comprehensive loss components are included in the computation of net periodic pension and postretirement benefit cost (see Note 11 additional details).