CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents ($86,126 and $103,850 related to variable interest entities ("VIEs"))	$ 198,122	$ 193,685
Restricted cash	5,956	8,416
Restricted investments	75,409	70,974
Accounts receivable ($80,794 and $91,090 related to VIEs)	1,501,557	1,354,519
Retainage receivable ($86,033 and $89,132 related to VIEs)	573,151	562,375
Costs and estimated earnings in excess of billings ($30,739 and $22,764 related to VIEs)	1,155,202	1,123,544
Other current assets ($55,458 and $58,128 related to VIEs)	211,501	197,473
Total current assets	3,720,898	3,510,986
PROPERTY AND EQUIPMENT ("P&E"), net of accumulated depreciation of $401,805 and $388,147 (net P&E of $41,474 and $49,919 related to VIEs)	502,611	509,685
GOODWILL	205,143	205,143
INTANGIBLE ASSETS, NET	149,458	155,270
OTHER ASSETS	108,296	104,693
TOTAL ASSETS	4,686,406	4,485,777
CURRENT LIABILITIES:
Current maturities of long-term debt	184,954	124,054
Accounts payable ($78,304 and $93,848 related to VIEs)	744,222	682,699
Retainage payable ($16,333 and $13,967 related to VIEs)	272,533	252,181
Billings in excess of costs and estimated earnings ($421,236 and $422,847 related to VIEs)	891,164	844,389
Accrued expenses and other current liabilities ($16,008 and $25,402 related to VIEs)	197,582	206,533
Total current liabilities	2,290,455	2,109,856
LONG-TERM DEBT, less current maturities, net of unamortized discount and debt issuance costs totaling $20,259 and $23,343	717,379	710,422
DEFERRED INCOME TAXES	37,580	35,686
OTHER LONG-TERM LIABILITIES	198,064	199,288
TOTAL LIABILITIES	3,243,478	3,055,252
COMMITMENTS AND CONTINGENCIES (Note 11)
Stockholders' equity:
Preferred stock - authorized 1,000,000 shares ($1 par value), none issued
Common stock – authorized 75,000,000 shares ($1 par value), issued and outstanding 50,541,480 and 50,278,816 shares	50,577	50,279
Additional paid-in capital	1,120,487	1,117,972
Retained earnings	331,362	313,991
Accumulated other comprehensive loss	(43,128)	(42,100)
Total stockholders' equity	1,459,298	1,440,142
Noncontrolling interests	(16,370)	(9,617)
TOTAL EQUITY	1,442,928	1,430,525
TOTAL LIABILITIES AND EQUITY	$ 4,686,406	$ 4,485,777