Summary of Significant Accounting Policies - Schedule of Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of period	$ 331,068	$ 303,503
Other comprehensive income before reclassifications	1,096	(58)
Amounts reclassified from accumulated other comprehensive income, net of tax	(208)	(97)
Net current period other comprehensive (loss) income, net	888	(155)
Balance at end of period	361,259	331,068
Amounts reclassified from accumulated other comprehensive income (loss), tax	69
Pension and postretirement benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of period	263	360
Other comprehensive income before reclassifications		0
Amounts reclassified from accumulated other comprehensive income, net of tax	(208)	(97)
Net current period other comprehensive (loss) income, net	(208)	(97)
Balance at end of period	55	263
Amounts reclassified from accumulated other comprehensive income (loss), tax		16
Foreign currency
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of period	162	220
Other comprehensive income before reclassifications	1,096	(58)
Net current period other comprehensive (loss) income, net	1,096	(58)
Balance at end of period	1,258	162
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of period	425	580
Balance at end of period	$ 1,313	$ 425