ACQUISITIONS ASSETS ACQUIRED (TABLES) (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018	Apr. 30, 2018	Mar. 31, 2018
Business Acquisition [Line Items]
Total deferred tax assets, net	$ 16,700,000
Goodwill	205,180,000	$ 204,633,000
Accrued employee compensation and benefits	$ 101,743,000	$ 83,437,000
SCS
Business Acquisition [Line Items]
Cash			$ 4,530,000
Accounts receivable.			985,000
Prepaid Expenses			39,000
Goodwill			1,231,000
Total assets acquired			10,404,000
Accounts payable			216,000
Accrued employee compensation and benefits			27,000
Accrued expenses			21,000
Deferred tax liabilities			629,000
Total liabilities assumed			893,000
Total purchase price			9,511,000
SCS | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets			$ 3,619,000
BH
Business Acquisition [Line Items]
Total purchase price				$ 1