CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net income	$ 277,674	$ 87,160
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	111,413	95,959
Impairment of right-of-use asset	5,361	0
Deferred taxes	(1,427)	(12,553)
Compensation expense related to share-based compensation plans	14,973	14,090
(Gain) loss on sale of assets	(21,097)	(8,978)
Changes in operating assets and liabilities:
Restricted investments	7,368	253
Accounts receivable, net	(55,994)	(100,102)
Prepaid taxes	(1,408)	1,248
Prepaid expenses and other current assets	6,818	(6,059)
Other assets	(3,381)	(1,670)
Accounts payable	(21,169)	81,908
Accrued expenses	41,165	33,424
Non-current liabilities	(9,825)	(6,622)
Net cash provided by operating activities	350,471	178,058
Cash flows from investing activities:
Proceeds from sale of equipment	33,994	30,558
Purchases of property and equipment	(157,664)	(84,076)
Cash used in acquisitions	(102,661)	(90)
Net cash used in investing activities	(226,331)	(53,608)
Cash flows from financing activities:
Proceeds from issuance of debt	127,017	70,695
Repayments of long-term debt	(81,905)	(82,804)
Purchase of treasury stock	(75,000)	0
Purchase of treasury stock from related party	(34,767)	0
Stock withheld for payments of withholding taxes	(5,778)	(4,038)
Finance lease payments	(1,582)	(2,142)
Net cash used in financing activities	(72,015)	(18,289)
Effect of exchange rate changes on cash and cash equivalents	12	(11)
Net increase in cash and cash equivalents	52,137	106,150
Cash and cash equivalents beginning of the period	159,784	124,506
Cash and cash equivalents end of the period	211,921	230,656
Supplemental disclosures of cash paid for:
Interest	5,840	5,621
Income taxes	$ 96,165	$ 21,867