Taxes on Income (Tax Benefits) - Components of Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 2,150	$ (2,112)	$ 8,603
Foreign	5,600	10,586	6,078
State	528	2,635	527
Subtotal	8,278	11,109	15,208
Deferred:
Federal	218	(18,629)	(2,075)
Foreign	1,382	3,034	(727)
State	(673)	646	(252)
Subtotal	927	(14,949)	(3,054)
Total tax provision	$ 9,205	$ (3,840)	$ 12,154