CASH FLOW INFORMATION (Tables)

6 Months Ended

Jun. 30, 2020

CASH FLOW INFORMATION

Schedule of supplemental cash flow information

	Six Months Ended
	June 30,
	2019		2020
Supplemental disclosures of cash flow information—cash paid for:
Interest	$	25,904	$	23,542
Income taxes	$	3,356	$	3,765
Supplemental non-cash cash flow information:
Fair market value of estimated contingent consideration in connection with acquisitions	$	50,945	$	6,332
Net tangible liabilities acquired in connection with business acquisitions	$	(3,888)	$	(7,599)
Operating lease assets	$	168,867	$	202,548
Operating lease liabilities	$	180,451	$	221,339