Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net income	$ 55,926	$ 137,214
Adjustments to reconcile net income to net cash provided by operating activities:
Distributions from unconsolidated subsidiaries	7,486	11,633
Depreciation and amortization	51,039	49,620
Provision for expected credit losses	94	67
Equity in earnings of unconsolidated subsidiaries	(5,397)	(9,919)
Loss (gain) on sale or disposal of assets	(23)	72
Stock compensation expense	8,823	6,709
Amortization of debt discount, premium and issuance costs	558	543
Deferred income taxes	420	(897)
Changes in operating assets and liabilities, net of effects of business combinations:
Accounts receivable	(52,225)	(60,142)
Other current assets	(1,819)	(4,425)
Other assets	2,686	961
Accounts payable	16,074	23,460
Accrued expenses	(31,076)	21,167
Government advances	(62,928)	0
Unearned government assistance	101	19,207
Income taxes	16,598	44,618
Net cash provided by operating activities	6,337	239,888
Investing activities
Business combinations, net of cash acquired	(5,186)	(6,314)
Purchases of property and equipment	(46,845)	(39,719)
Investment in businesses	(3,337)	(6,571)
Proceeds from sale of assets	37	19
Net cash used in investing activities	(55,331)	(52,585)
Financing activities
Borrowings on revolving facilities	280,000	0
Payments on revolving facilities	(100,000)	0
Borrowings of other debt	15,794	8,915
Principal payments on other debt	(9,188)	(9,342)
Dividends paid to common stockholders	(16,691)	0
Repurchase of common stock	(51,676)	0
Decrease in overdrafts	(7,608)	0
Proceeds from issuance of non-controlling interests	5,229	0
Distributions to and purchases of non-controlling interests	(10,295)	(13,663)
Net cash provided by (used in) financing activities	105,565	(14,090)
Net increase in cash and cash equivalents	56,571	173,213
Cash and cash equivalents at beginning of period	74,310	577,061
Cash and cash equivalents at end of period	130,881	750,274
Supplemental Information
Cash paid for interest	53,517	52,470
Cash paid for taxes	$ 923	$ 1,343