CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
OPERATING ACTIVITIES
Net income	$ 71,283	$ 69,569
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	32,187	31,591
Amortization of intangibles	3,203	3,232
Share-based compensation expense	2,235	2,763
Provision for losses on accounts receivable	1,427	1,628
Change in deferred income taxes	(9,814)	(1,417)
Gain on sale of property and equipment	(9)	(3,002)
Pre-tax gain on sale of discontinued operations	(69,083)
Changes in operating assets and liabilities:
Receivables	43,977	(103,677)
Prepaid expenses	(1,464)	(2,858)
Other assets	3,874	(2,781)
Income taxes	6,221	(3,017)
Operating right-of-use assets and lease liabilities, net	1,570	14
Accounts payable, accrued expenses, and other liabilities	(64,944)	(3,298)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	20,663	(11,253)
INVESTING ACTIVITIES
Purchases of property, plant and equipment, net of financings	(34,657)	(19,471)
Proceeds from sale of property and equipment	1,833	5,334
Proceeds from sale of discontinued operations	101,138
Purchases of short-term investments	(35,588)	(12,339)
Proceeds from sale of short-term investments	41,865	23,590
Capitalization of internally developed software	(3,631)	(4,510)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	70,960	(7,396)
FINANCING ACTIVITIES
Borrowings under credit facilities		58,000
Payments on long-term debt	(17,649)	(32,967)
Net change in book overdrafts	(10,493)	955
Deferred financing costs	63
Payment of common stock dividends	(2,915)	(1,978)
Purchases of treasury stock	(14,092)	(16,506)
Payments for tax withheld on share-based compensation	(1,590)	(1,367)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(46,676)	6,137
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	44,947	(12,512)
CASH AND CASH EQUIVALENTS AT END OF PERIOD	203,319	64,108
NONCASH INVESTING ACTIVITIES
Equipment financed	3,478	8,113
Accruals for equipment received	1,453	712
Lease liabilities arising from obtaining right-of-use assets	$ 30,581	$ 25,473