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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 17,230	$ 13,236
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	32,111	30,576
Deferred taxes	4,325	696
Compensation expense related to share-based compensation plans	5,117	4,097
(Gain) loss on sale of assets	(1,924)	121
Other operating activities		240
Changes in operating assets and liabilities, net of acquisitions:
Restricted investments	1,618	4,409
Accounts receivable, net	8,389	(9,480)
Prepaid taxes	350	(50)
Prepaid expenses and other current assets	8,825	9,054
Other assets	(189)	(477)
Accounts payable	36,820	19,657
Accrued expenses	18,695	(28,551)
Non-current liabilities	(3,994)	(2,875)
Net cash provided by operating activities	127,373	40,653
Cash flows from investing activities:
Proceeds from sale of equipment	14,933	497
Purchases of property and equipment	(9,522)	(25,467)
Net cash provided by (used in) investing activities	5,411	(24,970)
Cash flows from financing activities:
Repayments of long-term debt	(33,381)	(24,373)
Stock withheld for payments of withholding taxes	(3,759)	(3,769)
Finance lease payments	(772)	(747)
Proceeds from issuance of debt	6,894	121,444
Net cash (used in) provided by financing activities	(31,018)	92,555
Effect of exchange rate changes on cash and cash equivalents	(8)	(87)
Net increase in cash and cash equivalents	101,758	108,151
Cash and cash equivalents beginning of the period	124,506	168,729
Cash and cash equivalents end of the period	226,264	276,880
Supplemental disclosures of cash paid for:
Interest	2,005	2,563
Income taxes	$ 317	$ 355

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