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Income Taxes (Tax Return Reported Federal Net Operating Losses and Tax Credits) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Income Taxes [Abstract]
Federal net operating losses expiring through the year 2032	$ 302,394
Research tax credits expiring through the year 2032	6,238
Alternative-minimum tax credit (no expiration)	$ 94

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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