Taxes on Income (Tax Benefits) - Effective Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Income taxes at U.S. federal statutory tax rate	$ 12,344	$ 425	$ (12,591)
State income taxes, net of federal income tax benefit	342	(94)	(3,073)
Divestitures	271	2,269	0
Meals and entertainment	736	761	863
Changes in taxes previously accrued	23	(489)	(1,932)
Foreign tax rate differences	(2,559)	(1,468)	(9,215)
Goodwill impairment	0	3,485	9,690
Recognition of uncertain tax positions	85	24	(96)
Settlement of escrow arrangement	0	(1,115)	0
Domestic Production Activities deduction	(1,017)	(528)	(81)
Incremental U.S. taxes on undistributed foreign earnings	0	2,102	0
Other matters	(1,278)	(245)	(396)
Total tax provision (benefit)	$ 6,109	$ 9,205	$ (3,840)
Effective tax rate	17.30%	757.60%	10.70%
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	$ 1,364	$ (756)	$ 7,785
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	$ (4,202)	$ 4,834	$ 5,206