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Summary of Significant Accounting Policies (Income Taxes Paid) (Details) (USD $)	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011 State and Local Jurisdiction [Member]	Dec. 31, 2009 State and Local Jurisdiction [Member]
Income taxes paid (refunds received)	$ (19,700,000)	$ 340,000	$ 800,000

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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