Subsequent Events (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended
Jul. 31, 2011
Subsequent Events (Textuals) [Abstract]
Underwritten public offering net proceeds per share	$ 23.09
Public offering price reflected to the public	$ 24.25
Underwritten discount, commissions and estimated transaction costs	$ 1.16
Net proceeds from public offerings	$ 18.5
Class Z Cumulative Preferred Stock [Member]
Subsequent Event [Line Items]
Class Z Cumulative Preferred Stock issued	800,000
Interest rate of Class Z cumulative preferred stock	7.00%
Par value of Class Z Cumulative Preferred Stock issued	$ 0.01

Gross offering net proceeds per share of preferred stock issued.

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- Definition

Net offering price per share of preferred stock issued.

+ Details

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- Definition

Preferred stock dividend rate percentage.

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- Definition

Subsequent events.

+ Details

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- Definition

Underwritten discount,commissions and estimated transaction costs.

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- Definition

Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8

+ Details

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- Definition

Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29
-Article 5

+ Details

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- Definition

Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 19
-Subparagraph a

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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