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Stockholders' Equity (Details) (USD $)	3 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2011	Sep. 30, 2012 ATM Sales Program	May 06, 2010 ATM Sales Program
Equity Offerings
Common stock, shares outstanding	82,937,405						82,937,405
Maximum aggregate gross sales price of common stock									$ 75,000,000
Common stock available to be sold under the plan								34,300,000
Dividends declared and paid
Dividends Per Share	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19
Total Dividends	$ 15,758,000	$ 15,758,000	$ 15,758,000	$ 15,473,000	$ 15,473,000	$ 15,473,000

X

- Definition

Represents the amount of common stock available to be sold under the equity offering plan.

+ References

No definition available.

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X

- Definition

Maximum value of stock that may be offered and sold under the demand offering sales agreement.

+ References

No definition available.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Section S99

-Paragraph 1

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Number 12

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-Publisher SEC

-Name Regulation S-X (SX)

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Equity impact of common stock cash dividends declared by an entity during the period. This element includes paid and unpaid dividends declared during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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