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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
OPERATING ACTIVITIES      
Net income $ 298,209 $ 213,521 $ 71,100
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 127,119 118,864 114,379
Amortization of intangibles 12,920 5,357 4,012
Pension settlement expense     89
Share-based compensation expense 12,775 11,426 10,478
Provision for losses on accounts receivable 6,955 1,466 4,327
Change in deferred income taxes (6,250) (7,589) 7,715
Gain on sale of property and equipment (11,650) (8,520) (2,376)
Gain on sale of subsidiary (402) (6,923)  
Changes in operating assets and liabilities:      
Receivables (10,349) (122,782) (38,129)
Prepaid expenses (410) (1,482) (7,966)
Other assets (2,941) 354 2,646
Income taxes (5,041) 13,136 (1,712)
Operating right-of-use assets and lease liabilities, net 2,952 623 756
Accounts payable, accrued expenses, and other liabilities 46,932 106,064 40,670
NET CASH PROVIDED BY OPERATING ACTIVITIES 470,819 323,515 205,989
INVESTING ACTIVITIES      
Purchases of property, plant and equipment, net of financings (148,223) (58,412) (43,248)
Proceeds from sale of property and equipment 19,691 13,815 13,348
Business acquisition, net of cash acquired 2,279 (239,380)  
Proceeds from sale of subsidiary 475 9,013  
Purchases of short-term investments (182,352) (56,011) (165,133)
Proceeds from sale of short-term investments 64,329 73,182 216,735
Capitalization of internally developed software (17,282) (20,061) (14,241)
Purchase of long-term investments   (25,350)  
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES (261,083) (303,204) 7,461
FINANCING ACTIVITIES      
Borrowings under credit facilities 58,000 50,000 180,000
Borrowings under accounts receivable securitization program     45,000
Proceeds from notes payable 14,206 3,523  
Payments on long-term debt (115,540) (171,915) (326,098)
Net change in book overdrafts 8,356 (1,957) 6,510
Deferred financing costs (952) (314)  
Payment of common stock dividends (10,830) (8,139) (8,157)
Purchases of treasury stock (65,002) (83,100) (6,595)
Forward contract for accelerated share repurchase   (25,000)  
Payments for tax withheld on share-based compensation (16,222) (10,743) (2,065)
NET CASH USED IN FINANCING ACTIVITIES (127,984) (247,645) (111,405)
NET INCREASE IN CASH AND CASH EQUIVALENTS 81,752 (227,334) 102,045
Cash and cash equivalents at beginning of period 76,620 303,954 201,909
CASH AND CASH EQUIVALENTS AT END OF PERIOD 158,372 76,620 303,954
NONCASH INVESTING ACTIVITIES      
Equipment financed 82,425 59,700 61,803
Accruals for equipment received 4,337 1,704 1,667
Lease liabilities arising from obtaining right-of-use assets $ 87,294 $ 14,671 $ 67,819