CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 348,366	$ 193,685
Accounts receivable	1,565,909	1,354,519
Retainage receivable	621,414	562,375
Costs and estimated earnings in excess of billings	1,180,215	1,123,544
Other current assets	239,614	197,473
Accumulated depreciation	424,065	388,147
Property and equipment, net	485,861	509,685
Unamortized discount and debt issuance costs, current	3,115	0
Accounts payable	811,987	682,699
Retainage payable	296,200	252,181
Billings in excess of costs and estimated earnings	911,378	844,389
Accrued expenses and other current liabilities	233,241	206,533
Unamortized discount and debt issuance costs, non-current	$ 20,934	$ 23,343
Preferred stock, shares authorized (in shares)	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 equivalents	$ 104,955	$ 103,850
Accounts receivable	106,085	91,090
Retainage receivable	110,794	89,132
Costs and estimated earnings in excess of billings	39,147	22,764
Other current assets	56,504	58,128
Property and equipment, net	17,634	49,919
Accounts payable	101,034	93,848
Retainage payable	22,864	13,967
Billings in excess of costs and estimated earnings	413,659	422,847
Accrued expenses and other current liabilities	$ 12,581	$ 25,402