CONSOLIDATED BALANCE SHEETS Consolidated Balance Sheets Parenthetical (Assets and Liabilities) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2012
Cash and cash equivalents	$ 247,833		$ 321,990		$ 237,951
Property and equipment, net	471,265		481,478		439,664
Accounts payable	188,124		202,541		186,290
Billings in excess of costs and estimated earnings	144,044		139,692		75,629
Accrued expenses and other current liabilities	200,521		169,979		155,322
Consolidated Construction Joint Venture [Member] | Joint Venture Consolidated [Member]
Cash and cash equivalents	63,806	[1]	105,865	[1]	67,685	[1]
Receivables, Net, Current	59,807		43,902		26,903
Property and equipment, net	34,891		41,114		6,919
Accounts payable	18,297		34,536		31,135
Billings in excess of costs and estimated earnings	72,094	[1]	72,490	[1]	17,979	[1]
Accrued expenses and other current liabilities	$ 9,153		$ 8,312		$ 3,027

[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 between periods.