Accumulated Other Comprehensive Income (Loss) - Components of and Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from AOCI, tax	$ (1)	$ 4,000
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period	331,068	303,503
Other comprehensive income (loss) before reclassifications	(627)	(257)
Amounts reclassified from accumulated other comprehensive income, net of tax	1	(12)
Net current period other comprehensive income (loss), net of tax	(626)	(269)
Balance at end of period	335,721	308,613
Unrecognized pension and postretirement benefits
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period	263	360
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income, net of tax	1	(12)
Net current period other comprehensive income (loss), net of tax	1	(12)
Balance at end of period	264	348
Foreign currency
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period	162	220
Other comprehensive income (loss) before reclassifications	(627)	(257)
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0
Net current period other comprehensive income (loss), net of tax	(627)	(257)
Balance at end of period	(465)	(37)
Accumulated other comprehensive income (loss)
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period	425	580
Other comprehensive income (loss) before reclassifications	(627)
Balance at end of period	$ (201)	$ 311