ACQUISITIONS (ASSETS ACQUIRED TABLE) (Details) - USD ($)	Jun. 30, 2018	Apr. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Nov. 08, 2017	Apr. 03, 2017
Business Acquisition [Line Items]
Total deferred tax assets, net	$ 17,500,000
Goodwill	203,518,000			$ 206,694,000
Accrued employee compensation and benefits	$ 75,773,000			$ 83,997,000
SCS
Business Acquisition [Line Items]
Cash		$ 4,509,000
Accounts receivable.		982,000
Property, plant and equipment.		8,000
Goodwill		1,222,000
Total assets acquired		10,340,000
Accounts payable		265,000
Accrued employee compensation and benefits		1,000
Accrued expenses		252,000
Deferred tax liabilities		629,000
Total liabilities assumed		1,147,000
Total purchase price		9,193,000
SCS | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets		$ 3,619,000
BH
Business Acquisition [Line Items]
Total purchase price			$ 1
Motif [Member]
Business Acquisition [Line Items]
Cash					$ 5,997,000
Accounts receivable.					5,187,000
Prepaid Expenses					1,248,000
Other assets					670,000
Property, plant and equipment.					2,182,000
Income Taxes Receivable					1,691,000
Goodwill					39,147,000
Total assets acquired					93,322,000
Accounts payable					2,789,000
Accrued employee compensation and benefits					5,249,000
Accrued expenses					104,000
Deferred tax liabilities					11,402,000
Other					340,000
Total liabilities assumed					19,884,000
Total purchase price					73,438,000
Motif [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets					$ 37,200,000
Connextions
Business Acquisition [Line Items]
Accounts receivable.						$ 15,959,000
Prepaid Expenses						241,000
Other assets						51,000
Property, plant and equipment.						7,594,000
Goodwill						35,272,000
Total assets acquired						94,117,000
Accounts payable						1,000
Accrued employee compensation and benefits						346,000
Accrued expenses						386,000
Deferred tax liabilities						15,273,000
Deferred revenue.						399,000
Total liabilities assumed						16,405,000
Total purchase price						77,712,000
Connextions | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets						$ 35,000,000