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Summary of Significant Accounting Policies (Income Taxes Paid) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income taxes paid (refunds received)	$ 580,000	$ 340,000	$ (19,700,000)

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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