Investments and Fair Value Measurements Fair Value Inputs, Quantitative Information (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2012 years		Dec. 31, 2011 years
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Warrants	$ 1,319	[1]	$ 1,962	[2]
Fair value of derivatives embedded within convertible debt	154,555		133,500
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Warrants	1,319	[1]	1,962	[2]
Fair value of derivatives embedded within convertible debt	154,555		133,500
Option Model [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Warrants	1,319		1,962
Discounted Cash Flow Valuation Technique [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of derivatives embedded within convertible debt	$ 154,555		$ 133,500
Warrants [Member] | Option Model [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Stock price	$ 1.78		$ 2.48
Exercise price	$ 1.68		$ 1.68
Term (in years)	4.6		4.9
Volatility	93.81%		94.10%
Dividend rate	0.00%		0.00%
Risk-free return	0.94%		0.83%
Derivative Financial Instruments, Liabilities [Member] | Discounted Cash Flow Valuation Technique [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assumed annual stock dividend	5.00%		5.00%
Assumed annual cash dividend	$ 1.60		$ 1.60
Yield to worst call on Company's Senior Secured Notes	5.57%		9.33%
Average spread of unsecured debt	1.26%		1.49%
Average spread of subordinated debt	1.46%		1.89%
Discount rate	8.25%		12.50%
Minimum [Member] | Derivative Financial Instruments, Liabilities [Member] | Discounted Cash Flow Valuation Technique [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount rate	7.75%		12.00%
Maximum [Member] | Derivative Financial Instruments, Liabilities [Member] | Discounted Cash Flow Valuation Technique [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount rate	8.75%		13.00%

[1] Warrants include 1,000,000 of LTS Warrants received on November 4, 2011 which were carried at $1,248 as of March 31, 2012 and are included in "Other assets". The company recognized a loss of $642 for the three months ended March 31, 2012 related to the change in fair value.

[2] Warrants include 1,000,000 of LTS Warrants received on November 4, 2011 which were carried at $1,890 as of December 31, 2011 and are included in "Other assets".