CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents ($53,575 and $53,067 related to variable interest entities (VIEs))	$ 138,569	$ 192,868
Restricted cash	3,434	4,780
Restricted investments	52,900	53,014
Accounts receivable ($57,008 and $30,003 related to VIEs)	1,272,932	1,265,717
Retainage receivable ($24,288 and $12,410 related to VIEs)	490,751	535,939
Costs and estimated earnings in excess of billings	1,044,233	932,758
Other current assets ($35,657 and $0 related to VIEs)	141,472	89,316
Total current assets	3,144,291	3,074,392
PROPERTY AND EQUIPMENT ("P&E"), net of accumulated depreciation of $337,101 and $359,188 (net P&E of $41,150 and $11,641 related to VIEs)	490,614	467,499
GOODWILL	585,006	585,006
INTANGIBLE ASSETS, NET	87,683	89,454
OTHER ASSETS	50,171	47,772
TOTAL ASSETS	4,357,765	4,264,123
CURRENT LIABILITIES:
Current maturities of long-term debt	28,105	30,748
Accounts payable ($44,118 and $19,243 related to VIEs)	625,436	699,971
Retainage payable	236,545	261,820
Billings in excess of cost and estimated earnings ($240,545 and $120,952 related to VIEs)	574,392	456,869
Accrued expenses and other current liabilities	134,264	132,438
Total current liabilities	1,598,742	1,581,846
LONG-TERM DEBT, less current maturities, net of unamortized discounts and debt issuance costs totaling $40,437 and $45,631	794,509	705,528
DEFERRED INCOME TAXES	106,284	108,504
OTHER LONG-TERM LIABILITIES	145,764	163,465
TOTAL LIABILITIES	2,645,299	2,559,343
COMMITMENTS AND CONTINGENCIES (NOTE 9)
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 50,010,863 and 49,781,010 shares	50,011	49,781
Additional paid-in capital	1,093,874	1,084,205
Retained earnings	631,004	622,007
Accumulated other comprehensive loss	(44,805)	(42,718)
Total stockholders' equity	1,730,084	1,713,275
Noncontrolling interests	(17,618)	(8,495)
TOTAL EQUITY	1,712,466	1,704,780
TOTAL LIABILITIES AND EQUITY	$ 4,357,765	$ 4,264,123