This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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The effective interest rate on the liability component of convertible debt instrument which may be settled in cash upon conversion, including partial cash settlement.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Investments and Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Assets:
Investment securities available for sale	$ 134,141		$ 134,141
Liabilities:
Income (loss) from embedded derivatives	2,450	(6,003)	5,499	(27,060)
Nonrecurring nonfinancial assets subject to fair value measurements	0		0		0
Fair Value, Measurements, Recurring [Member] \| Total
Assets:
Money market funds	219,533		219,533		372,718
Certificates of deposit	2,234		2,234		2,240
Bonds	7,577		7,577		6,306
Warrants	806		806		769
Total	364,291		364,291		452,017
Liabilities:
Fair value of derivatives embedded within convertible debt	166,629		166,629		172,128
Total	166,629		166,629		172,128
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Money market funds	219,533		219,533		372,718
Certificates of deposit	0		0		0
Bonds	7,577		7,577		6,306
Investment securities available for sale	79,947		79,947
Warrants	0		0		0
Total	307,057		307,057		448,131
Liabilities:
Fair value of derivatives embedded within convertible debt	0		0		0
Total	0		0		0
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2)
Assets:
Money market funds	0		0		0
Certificates of deposit	2,234		2,234		2,240
Bonds	0		0		0
Investment securities available for sale	6,744		6,744
Warrants	0		0		0
Total	56,428		56,428		3,117
Liabilities:
Fair value of derivatives embedded within convertible debt	0		0		0
Total	0		0		0
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3)
Assets:
Money market funds	0		0		0
Certificates of deposit	0		0		0
Bonds	0		0		0
Investment securities available for sale	0		0
Warrants	806		806		769
Total	806		806		769
Liabilities:
Fair value of derivatives embedded within convertible debt	166,629		166,629		172,128
Total	166,629		166,629		172,128
Equity securities
Assets:
Investment securities available for sale	86,691		86,691
Equity securities \| Fair Value, Measurements, Recurring [Member] \| Total
Assets:
Investment securities available for sale	86,691		86,691		69,984
Equity securities \| Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale					69,107
Equity securities \| Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale					877
Equity securities \| Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale					0
U.S. Government securities \| Fair Value, Measurements, Recurring [Member] \| Total
Assets:
Investment securities available for sale	10,094		10,094
U.S. Government securities \| Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	0		0
U.S. Government securities \| Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	10,094		10,094
U.S. Government securities \| Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0		0
Corporate securities \| Fair Value, Measurements, Recurring [Member] \| Total
Assets:
Investment securities available for sale	30,031		30,031
Corporate securities \| Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	0		0
Corporate securities \| Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	30,031		30,031
Corporate securities \| Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0		0
U.S. mortgage backed securities \| Fair Value, Measurements, Recurring [Member] \| Total
Assets:
Investment securities available for sale	589		589
U.S. mortgage backed securities \| Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	0		0
U.S. mortgage backed securities \| Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	589		589
U.S. mortgage backed securities \| Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0		0
Commercial mortgage-backed securities \| Fair Value, Measurements, Recurring [Member] \| Total
Assets:
Investment securities available for sale	5,886		5,886
Commercial mortgage-backed securities \| Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	0		0
Commercial mortgage-backed securities \| Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	5,886		5,886
Commercial mortgage-backed securities \| Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0		0
U.S. asset backed securities \| Fair Value, Measurements, Recurring [Member] \| Total
Assets:
Investment securities available for sale	850		850
U.S. asset backed securities \| Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	0		0
U.S. asset backed securities \| Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	850		850
U.S. asset backed securities \| Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	0		0
Fixed income securities
Assets:
Investment securities available for sale	47,450		47,450
Fixed income securities \| Fair Value, Measurements, Recurring [Member] \| Total
Assets:
Investment securities available for sale	47,450		47,450
Fixed income securities \| Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investment securities available for sale	0		0
Fixed income securities \| Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available for sale	47,450		47,450
Fixed income securities \| Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3)
Assets:
Investment securities available for sale	$ 0		$ 0
Variable Interest 7.50% Senior Convertible Debentures [Member]
Liabilities:
Convertible debt effective interest rate			7.50%