Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 747,983	$ 577,061
Accounts receivable	898,823	896,763
Prepaid income taxes	15,460	5,686
Other current assets	117,075	114,490
Total Current Assets	1,779,341	1,594,000
Operating lease right-of-use assets	1,069,953	1,032,217
Property and equipment, net	936,695	943,420
Goodwill	3,399,794	3,379,014
Identifiable intangible assets, net	378,433	387,541
Other assets	335,257	319,207
Total Assets	7,899,473	7,655,399
Current Liabilities:
Current operating lease liabilities	226,419	220,413
Current portion of long-term debt and notes payable	18,059	12,621
Accounts payable	192,393	177,087
Accrued payroll	295,897	224,876
Accrued vacation	140,363	132,811
Accrued interest	9,894	29,240
Accrued other	250,176	228,948
Government advances (Note 15)	159,505	321,807
Unearned government assistance (Note 15)	2,414	82,607
Income taxes payable	31,253	7,956
Total Current Liabilities	1,326,373	1,438,366
Non-current operating lease liabilities	909,950	875,367
Long-term debt, net of current portion	3,384,164	3,389,398
Non-current deferred tax liability	120,274	132,421
Other non-current liabilities	167,770	168,703
Total Liabilities	5,908,531	6,004,255
Commitments and contingencies (Note 14)
Redeemable non-controlling interests	627,330	398,171
Stockholders’ Equity:
Common stock, $0.001 par value, 700,000,000 shares authorized, 134,850,735 and 134,144,993 shares issued and outstanding at 2020 and 2021, respectively	134	135
Capital in excess of par	501,710	509,128
Retained earnings	639,451	553,244
Accumulated other comprehensive income (loss)	4,203	(2,027)
Total Stockholders’ Equity	1,145,498	1,060,480
Non-controlling interests	218,114	192,493
Total Equity	1,363,612	1,252,973
Total Liabilities and Equity	$ 7,899,473	$ 7,655,399