Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	$ (12,780)	$ (11,856)
Other comprehensive income (loss) before reclassifications	229	(330)
Amounts reclassified from accumulated other comprehensive loss, net of tax	756	362
Tax	(400)	(200)
Net current period other comprehensive income, net of tax	985	32
Accumulated other comprehensive loss	(11,795)	(11,824)
Unrecognized pension and postretirement benefits
Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(11,968)	(11,891)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss, net of tax	756	362
Net current period other comprehensive income, net of tax	756	362
Accumulated other comprehensive loss	(11,212)	(11,529)
Foreign currency
Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(812)	35
Other comprehensive income (loss) before reclassifications	229	(330)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Net current period other comprehensive income, net of tax	229	(330)
Accumulated other comprehensive loss	$ (583)	$ (295)