Summary of Significant Accounting Policies - Schedule of Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of period	$ (12,780)	$ (11,856)
Other comprehensive income before reclassifications	(328)	(2,164)
Amounts reclassified from accumulated other comprehensive loss, net of tax	1,473	1,240
Amounts reclassified from accumulated other comprehensive loss, tax	(1,019)	(728)
Net current period other comprehensive loss (income), net	1,145	(924)
Accumulated other comprehensive loss	(11,635)	(12,780)
Pension and postretirement benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of period	(11,968)	(11,891)
Other comprehensive income before reclassifications	0	(1,317)
Amounts reclassified from accumulated other comprehensive loss, net of tax	1,473	1,240
Net current period other comprehensive loss (income), net	1,473	(77)
Accumulated other comprehensive loss	(10,495)	(11,968)
Foreign currency
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of period	(812)	35
Other comprehensive income before reclassifications	(328)	(847)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Net current period other comprehensive loss (income), net	(328)	(847)
Accumulated other comprehensive loss	$ (1,140)	$ (812)