Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	$ (11,856)	$ (7,524)
Other comprehensive income (loss) before reclassifications	(160)	66
Amounts reclassified from accumulated other comprehensive loss, net of tax	239	269
Net current period other comprehensive income (loss), net of tax	79	335
Accumulated other comprehensive (loss) income	(11,777)	(7,189)
Income tax benefit	(142)	(159)
Unrecognized pension and postretirement benefits
Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(11,891)	(9,280)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss, net of tax	239	269
Net current period other comprehensive income (loss), net of tax	239	269
Accumulated other comprehensive (loss) income	(11,652)	(9,011)
Income tax benefit	(142)	(159)
Foreign currency
Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	35	1,756
Other comprehensive income (loss) before reclassifications	(160)	66
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Net current period other comprehensive income (loss), net of tax	(160)	66
Accumulated other comprehensive (loss) income	(125)	1,822
Income tax benefit	$ 0	$ 0