Taxes on Income - Effective Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory income tax rate (as percent)	21.00%	35.00%
Operating Loss Carryforwards [Line Items]
Income taxes (benefit) at U.S. federal statutory tax rate	$ 621	$ (21,552)	$ 12,332
State income taxes, net of federal income tax benefit	(798)	2,270	342
Divestitures	2,133	0	271
Meals and entertainment	517	785	736
Changes in taxes previously accrued	(536)	(1,339)	23
Foreign tax rate differences	1,301	913	(2,559)
Share-based compensation	(1,427)	131	(90)
Goodwill impairment	291	6,359	0
Recognition of uncertain tax positions	(218)	(62)	85
Deemed mandatory repatriation	(842)	10,406	0
Release of deferred tax liability on foreign earnings	0	(7,051)	0
Domestic Production Activities deduction	0	(1,921)	(1,017)
Other matters	(820)	(1,287)	(1,176)
Total tax provision	$ (132)	$ 5,005	$ 6,109
Effective tax rate	(4.50%)	(8.10%)	17.30%
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Change in the balance of the valuation allowance for deferred tax assets allocated to income tax expense	$ 590	$ 4,598	$ 1,364
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Change in the balance of the valuation allowance for deferred tax assets allocated to income tax expense	$ (944)	$ 12,755	$ (4,202)