Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash From (Used in) Operating Activities [Abstract]
Net income		$ 87,329	$ 62,276	$ 46,896
Non-cash and non-operating items [Abstract]
Non-cash and non-operating items		139,122	78,448	71,544
Amortization and provisions		62,733	47,085	33,365
Equity awards compensation expense	[1]	43,259	23,989	19,600
Net gain (or loss) on disposal of non-current assets		(81)	(2,127)	141
Interest accrued and non-cash financial income and expenses		39	28	861
Change in deferred taxes		(10,024)	(15,748)	(5,315)
Income tax for the period		43,196	25,221	22,892
Change in working capital requirement [Abstract]
Change in working capital		(29,460)	15,231	4,661
(Increase) in trade receivables		(117,970)	(83,420)	(83,646)
Increase in trade payables		81,862	100,047	70,557
(Increase) in other current assets		(28,432)	(24,101)	(7,986)
Increase in other current liabilities		35,080	22,705	25,736
Income taxes paid		(43,522)	(18,805)	(6,820)
Cash from operating activities		153,469	137,150	116,281
Cash From (Used in) Investing Activities [Abstract]
Acquisition of intangibles assets, property, plant and equipment		(85,133)	(75,607)	(48,591)
Change in accounts payable related to intangible assets, property, plant and equipment		7,752	1,128	1,705
Payments for acquired businesses, net of cash acquired		(235,541)	(20,542)	(26,103)
Change in other financial non-current assets		159	(6,612)	(2,292)
Cash used to investing activities		(312,763)	(101,633)	(75,281)
Cash From (Used in) Financing Activities [Abstract]
Issuance of long term borrowings		84,022	4,023	5,628
Repayment of borrowings	[2]	(13,305)	(8,980)	(6,525)
Proceeds from capital increase		20,075	13,768	31,638
Change in other financial liabilities		(222)	(1,000)	272
Cash from financing activities		90,570	7,811	31,013
Change in net cash and cash equivalents		(68,724)	43,328	72,013
Net cash and cash equivalents - beginning of period		353,537	351,827	323,181
Effect of exchange rate changes on cash and cash equivalents		(14,496)	(41,618)	(43,367)
Net cash and cash equivalents - end of period		270,317	353,537	351,827
Shared-based compensation expense		41,589	$ 23,743	$ 19,469
Interest paid		$ 1,300

[1] $41.6 million of equity awards compensation expense consisted of share-based compensation expense according to ASC 718 - Compensation - stock compensation for the year ended December 31, 2016.

[2] Interest paid for the year ended December 31, 2016 amounted to $1.3 million, and was immaterial for the year ended December 31, 2015 and 2014.