Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Cash and cash equivalents	$ 483,443	$ 483,609
Accounts receivable, net	637,980	698,578
Contract assets	568,239	576,568
Prepaid expenses and other current assets	103,599	80,769
Property and equipment, net	110,617	121,027
Accounts payable	191,688	225,679
Accrued expenses and other current liabilities	582,610	650,753
Contract liabilities	$ 196,547	$ 201,864
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares, issued	146,751,406	146,609,288
Common stock, shares, outstanding	30,213,867	25,719,350
Treasury stock, shares	44,248,626	44,248,626
ESOP
Common stock, shares, outstanding	72,288,913	76,641,312
Consolidated Joint Ventures
Cash and cash equivalents	$ 57,563	$ 75,220
Accounts receivable, net	173,640	190,643
Contract assets	25,192	23,498
Prepaid expenses and other current assets	6,657	3,045
Property and equipment, net	2,283	2,629
Accounts payable	85,425	97,810
Accrued expenses and other current liabilities	70,015	68,801
Contract liabilities	$ 35,260	$ 33,922