Shareholders' Equity - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Beginning balance		$ (22,000)
Other comprehensive (loss) income before reclassifications, net of tax		(1,800)	$ 1,700
Ending balance		(19,200)	(22,000)
Defined Benefit Plans [Member]
Beginning balance		(18,200)
Other comprehensive (loss) income before reclassifications, net of tax	[1]	(2,900)
Amounts reclassified from accumulated other comprehensive loss, net of tax		400
Net current period other comprehensive income (loss)		(2,500)
Ending balance		(20,700)	(18,200)
Foreign Currency Translation [Member]
Beginning balance		(700)
Other comprehensive (loss) income before reclassifications, net of tax	[1]	700
Amounts reclassified from accumulated other comprehensive loss, net of tax
Net current period other comprehensive income (loss)		700
Ending balance			(700)
Accumulated Other Comprehensive Loss [Member]
Beginning balance		(18,900)
Other comprehensive (loss) income before reclassifications, net of tax	[1]	(2,200)
Amounts reclassified from accumulated other comprehensive loss, net of tax		400
Net current period other comprehensive income (loss)		(2,200)
Ending balance		$ (20,700)	$ (18,900)

[1] No income tax expense was recorded for liability adjustments for defined benefit plans for the year ended December 31, 2018.