CONSOLIDATED BALANCE SHEETS Consolidated Balance Sheets Parenthetical (Assets and Liabilities) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Cash and cash equivalents		$ 221,785	$ 255,961	$ 167,174	$ 229,121
Property and equipment, net		385,036	409,653	424,272
Accounts payable		196,885	151,935	205,493
Billings in excess of costs and estimated earnings		122,409	108,992	115,809
Accrued expenses and other current liabilities		224,101	200,652	221,618
Consolidated Construction Joint Venture [Member] | Joint Venture Consolidated [Member]
Cash and cash equivalents	[1]	41,052	61,276	29,518
Receivables, Net		36,527	36,781	45,483
Cost and estimated earnings in excess of billings	[1]	365	129	21,105
Property and equipment, net		6,068	11,969	16,172
Accounts payable		10,438	18,009	22,951
Billings in excess of costs and estimated earnings	[1]	13,794	32,830	23,138
Accrued expenses and other current liabilities		$ 1,148	$ 2,714	$ 3,110

[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.