CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 182,599	$ 193,685
Accounts receivable	1,586,560	1,354,519
Retainage receivable	581,495	562,375
Costs and estimated earnings in excess of billings	1,149,103	1,123,544
Other Current Assets	222,392	197,473
Accumulated depreciation	417,575	388,147
Property and equipment, net	504,722	509,685
Unamortized discount and debt issuance costs, current	11,911	0
Accounts payable	770,515	682,699
Retainage payable	278,045	252,181
Billings in excess of costs and estimated earnings	962,446	844,389
Accrued expenses and other current liabilities	209,576	206,533
Unamortized discount and debt issuance costs, non-current	$ 5,190	$ 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	50,771,288	50,278,816
Common stock, shares outstanding	50,771,288	50,278,816
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents	$ 92,056	$ 103,850
Accounts receivable	129,081	91,090
Retainage receivable	98,304	89,132
Costs and estimated earnings in excess of billings	26,392	22,764
Other Current Assets	55,286	58,128
Property and equipment, net	34,669	49,919
Accounts payable	110,676	93,848
Retainage payable	19,589	13,967
Billings in excess of costs and estimated earnings	434,608	422,847
Accrued expenses and other current liabilities	$ 16,212	$ 25,402