Summary of Significant Accounting Policies - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of period	$ 303,503	$ 277,452
Other comprehensive loss before reclassifications	(58)	(484)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(97)	13,657
Net current period other comprehensive income (loss), net	(155)	13,173
Balance at end of period	331,068	303,503
Amounts reclassified from accumulated other comprehensive loss, tax	16	(5,100)
Accounting Standards Update 2018-02
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Cumulative impact of adopting ASU 2018-02		(1,700)
Pension and postretirement benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of period	360	(11,597)
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(97)	13,657
Net current period other comprehensive income (loss), net	(97)	13,657
Balance at end of period	263	360
Amounts reclassified from accumulated other comprehensive loss, tax	16	(5,127)
Pension and postretirement benefits | Accounting Standards Update 2018-02
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Cumulative impact of adopting ASU 2018-02		(1,700)
Foreign currency
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of period	220	704
Other comprehensive loss before reclassifications	(58)	(484)
Net current period other comprehensive income (loss), net	(58)	(484)
Balance at end of period	162	220
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of period	580	(10,893)
Balance at end of period	$ 425	580
Accumulated other comprehensive income (loss) | Accounting Standards Update 2018-02
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Cumulative impact of adopting ASU 2018-02		$ 1,700