CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents	$ 116,075	$ 192,868
Accounts receivable	1,261,072	1,265,717
Retainage receivable	478,744	535,939
Other Current Assets	115,527	89,316
Property and equipment, net	490,669	467,499
Accounts payable	621,728	699,971
Billings in excess of costs and estimated earnings	573,190	456,869
Accrued expenses and other current liabilities	174,325	132,438
Unamortized discount and debt issuance cost	$ 34,998	$ 45,631
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	50,025,996	49,781,010
Common stock, shares outstanding	50,025,996	49,781,010
Variable Interest Entity, Primary Beneficiary [Member]
Cash equivalents	$ 43,131	$ 53,067
Accounts receivable	62,482	30,003
Retainage receivable	36,724	12,410
Other Current Assets	30,185	0
Property and equipment, net	51,508	11,641
Accounts payable	18,070	19,243
Billings in excess of costs and estimated earnings	263,764	120,952
Accrued expenses and other current liabilities	$ 34,828	$ 0