CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
OPERATING ACTIVITIES
Net income	$ 195,433	$ 298,209	$ 213,521
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	132,900	127,119	118,864
Amortization of intangibles	12,829	12,920	5,357
Share-based compensation expense	11,438	12,775	11,426
Provision for losses on accounts receivable	3,630	6,955	1,466
Change in deferred income taxes	(5,566)	(6,250)	(7,589)
(Gain) loss on sale of property and equipment	4,797	(11,650)	(8,520)
Gain on sale of subsidiary		(402)	(6,923)
Pre-tax gain on sale of discontinued operations	(70,201)
Lease impairment charges	30,162
Change in fair value of contingent consideration	(19,100)	18,300
Change in fair value of equity investment	(3,739)
Changes in operating assets and liabilities:
Receivables	41,189	(10,349)	(122,782)
Prepaid expenses	2,563	(410)	(1,482)
Other assets	3,830	(2,941)	354
Income taxes	(10,657)	(5,041)	13,136
Operating right-of-use assets and lease liabilities, net	2,920	2,952	623
Accounts payable, accrued expenses, and other liabilities	(10,261)	28,632	106,064
NET CASH PROVIDED BY OPERATING ACTIVITIES	322,167	470,819	323,515
INVESTING ACTIVITIES
Purchases of property, plant and equipment, net of financings	(219,021)	(148,223)	(58,412)
Proceeds from sale of property and equipment	7,763	19,691	13,815
Proceeds from sale of discontinued operations	100,949
Business acquisition, net of cash acquired		2,279	(239,380)
Proceeds from the sale of subsidiary		475	9,013
Purchases of short-term investments	(96,537)	(182,352)	(56,011)
Proceeds from sale of short-term investments	198,120	64,329	73,182
Purchase of long-term investments			(25,350)
Capitalization of internally developed software	(12,977)	(17,282)	(20,061)
NET CASH USED IN INVESTING ACTIVITIES	(21,703)	(261,083)	(303,204)
FINANCING ACTIVITIES
Borrowings under credit facilities		58,000	50,000
Proceeds from notes payable		14,206	3,523
Payments on long-term debt	(69,180)	(115,540)	(171,915)
Net change in book overdrafts	(14,101)	8,356	(1,957)
Deferred financing costs	55	(952)	(314)
Payment of common stock dividends	(11,542)	(10,830)	(8,139)
Purchases of treasury stock	(91,531)	(65,002)	(83,100)
Forward contract for accelerated share repurchase			(25,000)
Payments for tax withheld on share-based compensation	(10,311)	(16,222)	(10,743)
NET CASH USED IN FINANCING ACTIVITIES	(196,610)	(127,984)	(247,645)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	103,854	81,752	(227,334)
CASH AND CASH EQUIVALENTS AT END OF PERIOD	262,226	158,372	76,620
NONCASH INVESTING ACTIVITIES
Equipment financed	33,495	82,425	59,700
Accruals for equipment received	1,727	4,337	1,704
Lease liabilities arising from obtaining right-of-use assets	$ 62,425	$ 87,294	$ 14,671