Taxes on Income (Tax Benefits) - Net Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax assets:
Foreign tax credit carryforwards	$ 358	$ 1,477
Net operating loss carryforwards	14,688	19,355
Accrued expenses	24,449	21,378
Other	8,285	7,207
Total gross deferred income tax assets	47,780	49,417
Less valuation allowance	(18,897)	(19,353)
Net deferred income tax assets	28,883	30,064
Deferred income tax liabilities:
Property, plant and equipment	(11,438)	(7,499)
Intangible assets	(14,525)	(22,653)
Undistributed foreign earnings	(9,153)	(7,051)
Other	(8,248)	(6,859)
Total deferred income tax liabilities	(43,364)	(44,062)
Net deferred income tax liabilities	(14,481)	(13,998)
Current deferred income tax assets, net	7,804	9,516
Current deferred income tax liabilities, net	(5,029)	(3,935)
Noncurrent deferred income tax assets, net	2,130	3,334
Noncurrent deferred income tax liabilities, net	(19,386)	(22,913)
Net deferred income tax liabilities	(14,481)	$ (13,998)
Bayou Perma-Pipe Canada, Ltd
Deferred income tax liabilities:
Noncurrent deferred income tax liabilities, net	$ 0