CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents ($32,040 and $53,067 related to variable interest entities (VIEs))	$ 118,258	$ 192,868
Restricted cash	3,436	4,780
Restricted investments	53,116	53,014
Accounts receivable ($75,999 and $30,003 related to VIEs)	1,325,465	1,265,717
Retainage receivable ($31,694 and $12,410 related to VIEs)	492,937	535,939
Costs and estimated earnings in excess of billings	1,085,651	932,758
Other current assets ($33,033 and $0 related to VIEs)	130,023	89,316
Total current assets	3,208,886	3,074,392
PROPERTY AND EQUIPMENT (P&E), net of accumulated depreciation of $345,405 and $359,188 (net P&E of $47,559 and $11,641 related to VIEs)	494,498	467,499
GOODWILL	585,006	585,006
INTANGIBLE ASSETS, NET	86,797	89,454
OTHER ASSETS	49,981	47,772
TOTAL ASSETS	4,425,168	4,264,123
CURRENT LIABILITIES:
Current maturities of long-term debt	20,601	30,748
Accounts payable ($10,793 and $19,243 related to VIEs)	611,100	699,971
Retainage payable	213,430	261,820
Billings in excess of cost and estimated earnings ($261,187 and $120,952 related to VIEs)	648,287	456,869
Accrued expenses and other current liabilities ($46,164 and $0 related to VIEs)	162,102	132,438
Total current liabilities	1,655,520	1,581,846
LONG-TERM DEBT, less current maturities, net of unamortized discounts and debt issuance costs totaling $37,749 and $45,631	780,723	705,528
DEFERRED INCOME TAXES	106,636	108,504
OTHER LONG-TERM LIABILITIES	148,917	163,465
TOTAL LIABILITIES	2,691,796	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 50,025,996 and 49,781,010 shares	50,026	49,781
Additional paid-in capital	1,098,639	1,084,205
Retained earnings	652,276	622,007
Accumulated other comprehensive loss	(44,193)	(42,718)
Total stockholders' equity	1,756,748	1,713,275
Noncontrolling interests	(23,376)	(8,495)
TOTAL EQUITY	1,733,372	1,704,780
TOTAL LIABILITIES AND EQUITY	$ 4,425,168	$ 4,264,123