Fair Value Measurements (Schedule Of Assets Or Liabilities Measured On Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jul. 01, 2014	Jul. 01, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	$ 3,943	$ 16,252	$ 5,907	$ 15,935	$ 15,510	$ 14,115
Net unrealized (gains) losses, included in other income (loss)	11,718	(2,137)	9,603	(1,820)
Purchases and issuances	0	0	151	0
Sales and settlements, included in other income (loss)	(151)	0	(151)	0
Gross transfers in	0	0	0	0
Gross transfers out	0	0	0	0
Fair value, end of period	15,510	14,115	15,510	14,115	15,510	14,115
Changes in realized (gains) losses included in income on instruments held at end of period	0	0	0	0
Changes in unrealized (gains) losses included in income on instruments held at end of period	11,718	(2,137)	9,603	(1,820)
Series C Preferred Embedded Derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	2,551	7,416	3,761	7,205	10,297	6,588
Net unrealized (gains) losses, included in other income (loss)	7,746	(828)	6,536	(617)
Purchases and issuances	0	0	0	0
Sales and settlements, included in other income (loss)	0	0	0	0
Gross transfers in	0	0	0	0
Gross transfers out	0	0	0	0
Fair value, end of period	10,297	6,588	10,297	6,588	10,297	6,588
Changes in realized (gains) losses included in income on instruments held at end of period	0	0	0	0
Changes in unrealized (gains) losses included in income on instruments held at end of period	7,746	(828)	6,536	(617)
Warrant derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	1,241	8,836	2,146	8,730	5,213	7,527
Net unrealized (gains) losses, included in other income (loss)	3,972	(1,309)	3,067	(1,203)
Purchases and issuances	0	0	0	0
Sales and settlements, included in other income (loss)	0	0	0	0
Gross transfers in	0	0	0	0
Gross transfers out	0	0	0	0
Fair value, end of period	5,213	7,527	5,213	7,527	5,213	7,527
Changes in realized (gains) losses included in income on instruments held at end of period	0	0	0	0
Changes in unrealized (gains) losses included in income on instruments held at end of period	3,972	(1,309)	3,067	(1,203)
Conversion Loan Embedded Derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	151	0	0	0	0	0
Net unrealized (gains) losses, included in other income (loss)	0	0	0	0
Purchases and issuances	0	0	151	0
Sales and settlements, included in other income (loss)	(151)	0	(151)	0
Gross transfers in	0	0	0	0
Gross transfers out	0	0	0	0
Fair value, end of period	0	0	0	0	0	0
Changes in realized (gains) losses included in income on instruments held at end of period	0	0	0	0
Changes in unrealized (gains) losses included in income on instruments held at end of period	$ 0	$ 0	$ 0	$ 0