Notes Payable, Long Term Debt and Other Obligations Non Cash Interest Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Debt Disclosure [Abstract]
Amortization of debt discount	$ 4,004	$ 2,560	$ 7,441	$ 4,842
Amortization of deferred finance costs	751	1,464	1,461	2,881
Accelerated interest expense on 3.875% Variable Interest Senior Convertible Debentures converted	7,888	1,217	7,888	1,217
Non-cash Interest Expense	$ 12,643	$ 5,241	$ 16,790	$ 8,940