Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	$ (11,856)	$ (7,524)
Other comprehensive income (loss) before reclassifications	(696)	140
Amounts reclassified from accumulated other comprehensive loss, net of tax	131	121
Net current period other comprehensive income (loss), net of tax	(565)	261
Accumulated other comprehensive (loss) income	(12,421)	(7,263)
Income tax benefit	(73)	(72)
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	131	121
Net current period other comprehensive income (loss), net of tax	131	121
Accumulated other comprehensive (loss) income	(11,760)	(9,159)
Income tax benefit	(73)	(72)
Foreign currency
Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	35	1,756
Other comprehensive income (loss) before reclassifications	(696)	140
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Net current period other comprehensive income (loss), net of tax	(696)	140
Accumulated other comprehensive (loss) income	(661)	1,896
Income tax benefit	$ 0	$ 0