ACQUISITIONS (ASSETS ACQUIRED TABLE) (DETAILS) - USD ($) $ in Thousands	Sep. 30, 2017	Apr. 03, 2017	Dec. 31, 2016	Nov. 09, 2016	Aug. 08, 2014
Business Acquisition [Line Items]
Total deferred tax assets, net	$ 31,000
Goodwill	166,584		$ 129,648
Accrued employee compensation and benefits	$ 85,820		$ 66,133
Connextions [Member]
Business Acquisition [Line Items]
Accounts receivable.		$ 15,959
Prepaid Expenses		241
Other assets		51
Property, plant and equipment.		7,594
Goodwill		35,272
Total assets acquired		94,117
Accounts payable		1
Accrued employee compensation and benefits		346
Accrued expenses		386
Deferred revenue.		399
Deferred tax liabilities		15,273
Total liabilities assumed		16,405
Total purchase price		77,712
Connextions [Member] | Customer Relationships
Business Acquisition [Line Items]
Intangible assets		$ 35,000
Atelka [Member]
Business Acquisition [Line Items]
Cash				$ 2,655
Accounts receivable.				18,449
Prepaid Expenses				615
Property, plant and equipment.				3,161
Total deferred tax assets, net				638
Goodwill				20,275
Total assets acquired				56,293
Accounts payable				1,199
Accrued employee compensation and benefits				2,418
Accrued expenses				2,597
Other				1,678
Total liabilities assumed				7,892
Total purchase price				48,401
Atelka [Member] | Customer Relationships
Business Acquisition [Line Items]
Intangible assets				$ 10,500
rogenSi [Member]
Business Acquisition [Line Items]
Total purchase price					$ 34,400