CONSOLIDATED STATEMENTS OF STATEMENT OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
OPERATING ACTIVITIES
Net income	$ 191,497	$ 118,626
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	46,902	43,522
Provision for deferred income taxes	(1,715)	3,055
Provision for expected credit losses	4,673	9,769
Gain on sale of assets, net	(33,151)	(726)
Stock based compensation expense	7,841	7,640
Other, net	(62)	(352)
Changes in operating assets and liabilities	3,220	53,238
Net cash provided by operating activities	219,205	234,772
INVESTING ACTIVITIES
Cash used for acquisitions of companies, net of cash acquired	(28,385)	(56,030)
Purchases of equipment and property	(13,229)	(12,441)
Proceeds from sales of assets	70,414	1,330
Proceeds from sales of franchises	99	285
Other, net	(274)	490
Net cash provided by/(used in) investing activities	28,625	(66,366)
FINANCING ACTIVITIES
Payment of contingent consideration	(12,873)	(7,862)
Borrowings under revolving commitment	49,500	68,000
Repayments of term loan	(48,000)	(7,000)
Repayments of revolving commitment	(116,500)	(97,500)
Payment of dividends	(79,732)	(65,531)
Cash paid for common stock purchased	(10,289)	(8,085)
Net cash used in financing activities	(217,894)	(117,978)
Effect of exchange rate changes on cash	115	(9,875)
Net increase in cash and cash equivalents	30,051	40,553
Cash and cash equivalents at beginning of period	98,477	94,276
Cash and cash equivalents at end of period	128,528	134,829
Supplemental disclosure of cash flow information:
Non-cash additions to operating lease right-of-use assets	$ 86,954	$ 52,273