CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 198,122	$ 193,685
Accounts receivable	1,501,557	1,354,519
Retainage receivable	573,151	562,375
Costs and estimated earnings in excess of billings	1,155,202	1,123,544
Other Current Assets	211,501	197,473
Accumulated depreciation	401,805	388,147
Property and equipment, net	502,611	509,685
Accounts payable	744,222	682,699
Retainage payable	272,533	252,181
Billings in excess of costs and estimated earnings	891,164	844,389
Accrued expenses and other current liabilities	197,582	206,533
Unamortized discount and debt issuance costs	$ 20,259	$ 23,343
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares issued	0	0
Common stock, shares authorized	75,000,000	75,000,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares issued	50,541,480	50,278,816
Common stock, shares outstanding	50,541,480	50,278,816
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents	$ 86,126	$ 103,850
Accounts receivable	80,794	91,090
Retainage receivable	86,033	89,132
Costs and estimated earnings in excess of billings	30,739	22,764
Other Current Assets	55,458	58,128
Property and equipment, net	41,474	49,919
Accounts payable	78,304	93,848
Retainage payable	16,333	13,967
Billings in excess of costs and estimated earnings	421,236	422,847
Accrued expenses and other current liabilities	$ 16,008	$ 25,402