CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Cash and cash equivalent	$ 374,289	$ 193,685
Accounts receivable	1,415,063	1,354,519
Retainage receivable	648,441	562,375
Costs and estimated earnings in excess of billings	1,236,734	1,123,544
Other current assets	249,455	197,473
Property and equipment, net	489,217	509,685
Unamortized discount and debt issuance costs, current	2,040	0
Accounts payable	794,611	682,699
Retainage payable	315,135	252,181
Billings in excess of costs and estimated earnings	839,222	844,389
Accrued expenses and other current liabilities	215,207	206,533
Unamortized discount and debt issuance costs, non-current	$ 20,209	$ 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 (in shares)	0	0
Common stock, shares authorized (in shares)	112,500,000	75,000,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares issued (in shares)	50,827,205	50,278,816
Common stock, shares outstanding (in shares)	50,827,205	50,278,816
Variable Interest Entity, Primary Beneficiary
Cash and cash equivalent	$ 105,735	$ 103,850
Accounts receivable	86,012	91,090
Retainage receivable	122,335	89,132
Costs and estimated earnings in excess of billings	39,846	22,764
Other current assets	51,746	58,128
Property and equipment, net	12,840	49,919
Accounts payable	116,461	93,848
Retainage payable	26,439	13,967
Billings in excess of costs and estimated earnings	362,427	422,847
Accrued expenses and other current liabilities	$ 9,595	$ 25,402