CONSOLIDATED BALANCE SHEETS Consolidated Balance Sheets Parenthetical (Assets and Liabilities) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012
Cash and cash equivalents	$ 212,463		$ 321,990		$ 287,322
Property and equipment, net	456,524		481,478		432,293
Accounts payable	199,480		202,541		209,683
Billings in excess of costs and estimated earnings	144,706		139,692		91,348
Accrued expenses and other current liabilities	219,169		169,979		167,166
Consolidated Construction Joint Venture [Member] | Joint Venture Consolidated [Member]
Cash and cash equivalents	57,133	[1]	105,865	[1]	74,020	[1]
Receivables, Net, Current	47,696		43,902		31,028
Property and equipment, net	28,194		41,114		6,661
Accounts payable	20,075		34,536		30,975
Billings in excess of costs and estimated earnings	70,518	[1]	72,490	[1]	13,955	[1]
Accrued expenses and other current liabilities	$ 12,804		$ 8,312		$ 3,495

[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.