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Income Taxes and Distributions (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Income Tax Expense
Tax at statutory rate on earnings from continuing operations before unconsolidated entities, noncontrolling interests and income taxes	$ 64,979	$ 54,750	$ 26,111
Increase in valuation allowance	9,234	(4,732)	317
Tax at statutory rate on earnings not subject to federal income taxes	(72,640)	(48,630)	(26,064)
Other differences	6,039	0	0
Income tax (expense) benefit	$ 7,612	$ 1,388	$ 364

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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