Stockholders' Equity AOCI Reclassification (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service cost	[1]	$ 50	$ 50
Actuarial loss	[1]	(164)	(406)
Total before tax		(214)	(456)
Tax effect		0	0
Total reclassifications for the period, net of tax	[2]	$ (214)	$ (456)

[1] These accumulated other comprehensive loss components are included in the computation of net periodic pension and postretirement benefit cost included in sales, general and administrative expense.

[2] See reclassifications from accumulated other comprehensive loss table below for details of reclassification from accumulated other comprehensive loss for the three month periods ended March 31, 2017 and 2016.