Stockholders' Equity AOCI Reclassification (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service cost	[1]	$ (50)	$ (50)	$ (100)		$ (100)
Actuarial loss	[1]	(164)	(406)	(328)		(812)
Total before tax		(214)	(456)	(428)		(912)
Tax effect		0	0	0		0
Total reclassifications for the period, net of tax		$ (214)	$ (456)	$ (428)	[2]	$ (912)	[2]

[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 six month periods ended June 30, 2017 and 2016.