ACQUISITION (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Business Acquisition [Line Items]
Revenues	$ 652,243	$ 588,103	$ 1,935,985	$ 1,661,023
2020 Acquisitions
Business Acquisition [Line Items]
Number of acquisitions			2
Purchase price including contingent consideration	22,526		$ 22,526
Contingent consideration fair value	5,292		5,292
Maximum amount of earnout payable	18,582		18,582
Intangible assets	7,280		7,280
Revenues	$ 1,245		$ 3,478