Income Taxes (Federal Tax Cost And The Tax Basis Components Of Distributable Earnings) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Income Taxes [Abstract]
Cost of investments	$ 9,247,318
Gross appreciation	224,625
Gross depreciation	(5,815)
Net unrealized appreciation (depreciation)	218,810
Capital loss carryforwards	$ (13,832)

The tax effect as of the balance sheet date of the amount of future tax deductions arising from capital losses in excess of statutory limitations in historical filings, and which can only be utilized if sufficient tax-basis income is generated in future periods and providing tax laws continue to allow such utilization.

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The aggregate cost of investments for Federal income tax purposes.

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- Definition

Aggregate gross unrealized appreciation for all Investments in which there is an excess of value over tax cost.

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- Definition

The aggregate gross unrealized depreciation for all Investments in which there is an excess of tax cost over value.

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- Definition

The net unrealized appreciation or depreciation.

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