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Income Taxes - Reconciliation of Income Tax to Expense (Benefit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Tax at statutory rate	$ (27,491)	$ (16,109)	$ (28,530)
State taxes, net of federal benefit	(1,821)	(1,580)	(2,780)
Change in valuation allowance	22,602	21,990	(16,807)
Section 382 limitation	0	0	45,728
Permanent interest disallowed	7,197	(4,466)	(70)
Credits and other	(487)	170	2,450
Provision for income tax benefit (expense)	$ 0	$ 5	$ (9)

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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- Definition

The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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