Notes Payable, Commitments and Contingencies (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Detail of interest expensed and incurred
Total interest incurred	$ 28,384	$ 37,180	$ 45,129
Interest expense			(1,634)
Interest capitalized	(600)		(3,736)
Total interest expense	$ 27,784	$ 37,180	$ 39,759