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Income taxes, Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income tax reconciliation [Abstract]
US		$ 80,690	$ 63,330	$ 117,385
International		37,943	35,891	18,331
Earnings before taxes on income		118,633	99,221	135,716
Federal tax at statutory rates		41,522	34,738	47,475
State taxes, net of federal benefit		1,274	529	852
Impact of foreign operations		(2,168)	(9,937)	(1,640)
Change in valuation allowance		314	10,458	(950)
Tax credits		(1,918)	(1,572)	(2,088)
Transition Tax		13,585	0	0
Change in U.S. Tax Rate		(13,403)	0	0
Stock Compensation		(3,978)	0	0
Other differences		(118)	1,103	733
Permanent differences		929	1,378	(82)
Total provision for income taxes		$ 36,039	$ 36,697	$ 44,300
Income Tax Disclosure [Line Items]
Effective annual tax rate		30.00%	37.00%	33.00%
Provisional tax benefit		$ (13,400)
Provisional tax expense		$ 13,600
Federal corporate tax rate		35.00%
Forecast [Member]
Income Tax Disclosure [Line Items]
Federal corporate tax rate	21.00%

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