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Stockholders' Equity: (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended		3 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 At-The-Market Stock Offering Program	Aug. 17, 2012 At-The-Market Stock Offering Program
Stock Offering Program
Par value of common stock (in dollars per share)	$ 0.01	$ 0.01		$ 0.01
Maximum price of common stock available to be issued			$ 322,104	$ 500,000
Maximum commission to sales agent (as a percent)				2.00%
Common stock sold			2,961,903
Proceeds from sale			177,896
Proceeds from sale, net	$ 175,869		$ 175,869

X

- Definition

Represents the maximum aggregate offering price of common stock available to be issued under the program.

+ References

No definition available.

+ Details

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- Definition

Represents the maximum percentage of commission to each sales agent of the proceeds from sales of common stock.

+ References

No definition available.

+ Details

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X

- Definition

The cash inflow from the additional capital contribution to the entity, before deducting commissions and other transactions costs.

+ References

No definition available.

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- Definition

Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

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-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

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- Definition

The cash inflow from the additional capital contribution to the entity.

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-Glossary Financing Activities

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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Number of new stock issued during the period.

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