Interest Expense (Interest Expense Schedule) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Interest Expense [Abstract]
Contractual interest on Convertible Debentures	$ 10,156	$ 10,156
Amortization of debt discount on the Convertible Debentures	1,935	1,783
Interest capitalized to Property and equipment, net	(388)	(144)
Credit facility and other interest expense	637	25
Total interest expense	$ 12,340	$ 11,820