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	12 Months Ended
	Dec. 31, 2012 years		Dec. 31, 2011 years
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Warrants	$ 769	[1]	$ 1,962	[2]
Fair value of derivatives embedded within convertible debt	172,128		133,500
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Warrants	769	[1]	1,962	[2]
Fair value of derivatives embedded within convertible debt	172,128		133,500
Option Model [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Warrants	769		1,962
Discounted Cash Flow [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	$ 172,128		$ 133,500
Warrant [Member] | Option Model [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Stock price (dollars per share)	$ 1.40		$ 2.48
Exercise price (dollars per share)	$ 1.68		$ 1.68
Term (in years)	3.8		4.9
Volatility	76.87%		94.12%
Dividend rate	0.00%		0.00%
Risk-free return	0.50%		0.83%
Derivative Financial Instruments, Liabilities [Member] | Discounted Cash Flow [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Stock price (dollars per share)	$ 14.87
Volatility	18.00%
Assumed annual stock dividend	5.00%		5.00%
Assumed annual cash dividend (dollars per share)	$ 1.60		$ 1.60
Convertible trading price	109.00%
Yield to worst call on the Company's senior secured notes			9.33%
Average spread of unsecured debt			1.49%
Average spread of subordinated debt			1.89%
Implied credit spread	10.50%
Discount rate			12.50%
Minimum [Member] | Derivative Financial Instruments, Liabilities [Member] | Discounted Cash Flow [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Implied credit spread	10.00%
Discount rate			12.00%
Maximum [Member] | Derivative Financial Instruments, Liabilities [Member] | Discounted Cash Flow [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Implied credit spread	11.00%
Discount rate			13.00%

[1] Warrants include 1,000,000 of LTS Warrants received on November 4, 2011 which were carried at $717 as of December 31, 2012 and are included in "Other assets". The Company recognized a loss of $1,174 for the year ended December 31, 2012 related to the change in fair value of the Warrants.

[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". The Company recognized income of $690 for the year ended December 31, 2011 related to the change in fair value from receipt. (See Note 14.)