Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 238,258	$ 229,097
Accounts receivable, net of allowances of $49,916 and $49,749	3,356,566	3,400,318
Contract assets	975,342	803,453
Inventories	94,264	84,659
Prepaid expenses and other current assets	201,185	215,050
Total current assets	4,865,615	4,732,577
Property and equipment, net of accumulated depreciation of $1,566,533 and $1,503,498	1,976,249	1,919,697
Operating lease right-of-use assets	238,529	240,605
Other assets, net	656,133	632,244
Other intangible assets, net of accumulated amortization of $799,905 and $682,498	1,685,260	1,801,180
Goodwill	3,593,315	3,528,886
Total assets	13,015,101	12,855,189
Current Liabilities:
Current maturities of long-term debt and short-term debt	21,865	29,166
Current portion of operating lease liabilities	76,983	78,251
Accounts payable and accrued expenses	2,318,389	2,254,671
Contract liabilities	800,578	802,872
Total current liabilities	3,217,815	3,164,960
Long-term debt, net of current maturities	3,812,411	3,724,474
Operating lease liabilities, net of current portion	170,347	170,427
Deferred income taxes	183,082	191,098
Insurance and other non-current liabilities	489,458	487,309
Total liabilities	7,873,113	7,738,268
Commitments and Contingencies
Equity:
Common stock, $0.00001 par value, 600,000,000 shares authorized, 170,437,992 and 168,546,513 shares issued, and 143,765,604 and 142,633,934 shares outstanding	2	2
Additional paid-in capital	2,637,240	2,615,410
Retained earnings	3,789,025	3,714,843
Accumulated other comprehensive loss	(224,414)	(237,689)
Treasury stock, 26,672,388 and 25,912,579 common shares	(1,064,334)	(980,265)
Total stockholders’ equity	5,137,519	5,112,301
Non-controlling interests	4,469	4,620
Total equity	5,141,988	5,116,921
Total liabilities and equity	$ 13,015,101	$ 12,855,189