Summary of Significant Accounting Policies - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of period	$ 277,452	$ 256,209
Other comprehensive income (loss) before reclassifications	(484)	1,844
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of $(5.1 million)	13,657	(1,102)
Amounts reclassified from accumulated other comprehensive loss, tax	5,100	300
Net current period other comprehensive income (loss), net	13,173	742
Balance at end of period	303,503	277,452
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	(11,597)	(10,495)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of $(5.1 million)	13,657	(1,102)
Amounts reclassified from accumulated other comprehensive loss, tax	(5,127)	292
Net current period other comprehensive income (loss), net	13,657	(1,102)
Balance at end of period	360	(11,597)
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	704	(1,140)
Other comprehensive income (loss) before reclassifications	(484)	1,844
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of $(5.1 million)	0	0
Net current period other comprehensive income (loss), net	(484)	1,844
Balance at end of period	220	704
Foreign currency | Accounting Standards Update 2018-02
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Cumulative impact of adopting ASU 2018-02	0
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of period	(10,893)	(11,635)
Balance at end of period	580	$ (10,893)
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