CONSOLIDATED BALANCE SHEETS Consolidated Balance Sheets Parenthetical (Assets and Liabilities) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Cash and cash equivalents	$ 161,218	$ 252,836	$ 188,147
Other Assets, Current	31,949	26,985	33,885
Property and equipment, net	409,860	385,129	391,989
Accounts payable	210,923	157,571	170,474
Billings in excess of costs and estimated earnings	90,484	92,515	106,086
Accrued expenses and other current liabilities	212,986	200,935	201,259
Consolidated Construction Joint Venture [Member] | Joint Venture Consolidated [Member]
Cash and cash equivalents	50,065	46,210	46,963
Receivables, Net	59,923	45,734	36,978
Other Assets, Current	8,940	4,863	2,562
Property and equipment, net	13,420	5,378	7,474
Accounts payable	25,061	11,909	12,554
Billings in excess of costs and estimated earnings	18,687	15,768	23,947
Accrued expenses and other current liabilities	$ 1,529	$ 1,171	$ 1,388