CONSOLIDATED BALANCE SHEETS Consolidated Balance Sheets Parenthetical (Assets and Liabilities) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014
Cash and cash equivalents	$ 239,403		$ 255,961		$ 205,780
Property and equipment, net	399,910		409,653		432,398
Accounts payable	121,013		151,935		141,241
Billings in excess of costs and estimated earnings	95,328		108,992		125,618
Accrued expenses and other current liabilities	225,255		200,652		193,307
Consolidated Construction Joint Venture [Member] | Joint Venture Consolidated [Member]
Cash and cash equivalents	52,884	[1]	61,276	[1]	27,612	[1]
Receivables, Net	39,711		36,781		39,014
Property and equipment, net	9,729		11,969		19,801
Accounts payable	14,960		18,009		22,136
Billings in excess of costs and estimated earnings	29,963	[1]	32,830	[1]	43,087	[1]
Accrued expenses and other current liabilities	$ 1,530		$ 2,714		$ 7,074

[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.