CONSOLIDATED BALANCE SHEETS CONSOLIDATED BALANCE SHEET (PARENTHETICALS - Assets and Liabilities) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash and cash equivalents		$ 252,836	$ 255,961	$ 229,121	$ 321,990
Property and equipment, net		385,129	409,653
Accounts payable		157,571	151,935
Billings in excess of costs and estimated earnings		92,515	108,992
Accrued expenses and other current liabilities		200,935	200,652
Consolidated Construction Joint Venture [Member] | Joint Venture Consolidated [Member]
Cash and cash equivalents	[1]	46,210	61,276
Receivables, net		45,734	36,781
Costs in Excess of Billings		4,863	1,746
Property and equipment, net		5,378	11,969
Accounts payable		11,909	18,009
Billings in excess of costs and estimated earnings	[1]	15,768	32,830
Accrued expenses and other current liabilities		$ 1,171	$ 2,714

[1] The volume and stage of completion of contracts from our consolidated construction joint ventures may cause fluctuations in cash and cash equivalents as well as billings in excess of costs and estimated earnings and costs in excess of billings and estimated earnings between periods.