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Income Taxes: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Income tax benefit
Deferred	$ 934	$ 1,566	$ 2,159	$ 5,811
Income tax benefit	934	1,566	2,159	5,811
Components of net deferred tax assets
Net deferred tax assets	$ 31,342		$ 31,342		$ 26,829

X

- Definition

The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations.

+ References

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-Publisher FASB

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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- Definition

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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