Stockholders' Equity AOCI Reclassification (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Equity [Abstract]
Prior service cost	$ (70)	[1]	$ (81)	[1]	$ 141	[1]	$ (162)	[1]
Actuarial loss	(345)	[1]	(485)	[1]	(690)	[1]	(970)	[1]
Total before tax	(415)		(566)		(831)		(1,132)
Tax benefit	161		221		324		442
Total reclassifications for the period, net of tax	$ (254)	[2]	$ (345)	[2]	$ (507)	[2]	$ (690)	[2]

[1] These accumulated other comprehensive loss components are included in the computation of net periodic pension and postretirement benefit cost for the three and six months ended June 30, 2014 and 2013 (see Note 11 for additional details).

[2] See reclassifications from accumulated other comprehensive loss table for details of reclassification from accumulated other comprehensive loss for the three and six months ended June 30, 2014 and 2013.