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Stockholders' Equity (Details) (USD $)	3 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2010	May 06, 2010
Stockholders' Equity
Common stock, shares outstanding (in shares)	82,937,405						81,437,405
Maximum aggregate gross sales price of common stock allowed under the ATM Sales Program								$ 75,000,000
Shares of common stock sold under the ATM Sales Program (in shares)	1,500,000
Dividends declared and paid
Dividends Per Share (in dollars per share)	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19
Total Dividends	15,473,000	15,473,000	15,473,000	15,139,000	15,140,000	15,139,000
Issuance of shares
Average price per share of common stock sold under the Sales Program (in dollars per share)	$ 12.00
Amount payable to the placement/sales agent	360,000
Offering related expenses incurred	256,000
Proceeds from the issuance of common stock, net	$ 17,400,000

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

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

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Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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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.

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Number of new stock issued during the period.

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