Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income including noncontrolling interests	$ 26,041	$ 45,496
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation and amortization	69,308	64,490
Amortization of debt issue costs	1,530	369
Loss (gain) on disposal of property and equipment	297	(43)
Provision for doubtful accounts	0	38
Deferred taxes	(4,217)	325
Foreign currency transaction gains and losses	2,395	1,185
Equity in earnings of unconsolidated joint ventures	(16,958)	(9,883)
Return on investments in unconsolidated joint ventures	18,132	15,893
Stock-based compensation	11,361	6,432
Contributions of treasury stock	26,518	29,468
Changes in assets and liabilities, net of acquisitions and newly consolidated joint ventures:
Accounts receivable	58,146	(49,618)
Contract assets	8,360	(70,739)
Prepaid expenses and other assets	(11,153)	(999)
Accounts payable	(34,372)	(6,228)
Accrued expenses and other current liabilities	(97,541)	(21,983)
Contract liabilities	(5,957)	(11,047)
Income taxes	(2,402)	4,048
Other long-term liabilities	(11,025)	(28,648)
Net cash provided by (used in) operating activities	38,463	(31,444)
Cash flows from investing activities:
Capital expenditures	(9,171)	(22,938)
Proceeds from sale of property and equipment	384	943
Payments for acquisitions, net of cash acquired	256	0
Investments in unconsolidated joint ventures	(26,373)	(3,844)
Return of investments in unconsolidated joint ventures	727	17
Proceeds from sales of investments in unconsolidated joint ventures	14,335	0
Net cash used in investing activities	(19,842)	(25,822)
Cash flows from financing activities:
Proceeds from borrowings under credit agreement	0	180,600
Repayments of borrowings under credit agreement	0	(180,600)
Payments for debt costs and credit agreement	(1,826)	0
Contributions by noncontrolling interests	872	223
Distributions to noncontrolling interests	(21,836)	(1,605)
Taxes paid on vested stock	(2,242)	(1,149)
Proceeds from issuance of common stock	2,773	1,684
Net cash used in financing activities	(22,259)	(847)
Effect of exchange rate changes	1,011	(641)
Net decrease in cash, cash equivalents, and restricted cash	(2,627)	(58,754)
Cash, cash equivalents and restricted cash:
Beginning of year	487,215	195,374
End of period	$ 484,588	$ 136,620