ACQUISITIONS ASSETS ACQUIRED (TABLES) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Feb. 07, 2020	Dec. 31, 2019	Oct. 26, 2019
Business Acquisition [Line Items]
Operating lease assets	$ 145,069		$ 150,808
Goodwill	305,531		301,694
Operating lease liability - short-term	45,314		45,218
Accrued employee compensation and benefits	105,329		114,165
Operating lease liability - long-term	$ 120,021		$ 127,395
Serendebyte
Business Acquisition [Line Items]
Cash		$ 3,123
Accounts receivable.		1,243
Prepaid Expenses		1,327
Property, plant and equipment.		14
Deferred tax assets		20
Goodwill		8,662
Total assets acquired		17,079
Accounts payable		120
Accrued employee compensation and benefits		1,025
Accrued income taxes		170
Accrued expenses		2,208
Deferred tax liabilities		727
Total liabilities assumed		4,250
Total purchase price		12,829
Serendebyte | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets		500
Serendebyte | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets		$ 2,190
FCR
Business Acquisition [Line Items]
Cash				$ 5,225
Accounts receivable.				10,659
Prepaid Expenses				357
Property, plant and equipment.				6,006
Other assets				224
Operating lease assets				5,127
Goodwill				96,739
Total assets acquired				171,477
Accounts payable				388
Operating lease liability - short-term				1,160
Accrued employee compensation and benefits				4,049
Accrued expenses				72
Operating lease liability - long-term				3,967
Total liabilities assumed				9,636
Total purchase price				161,841
FCR | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets				8,600
FCR | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets				$ 38,540