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Stockholders' Equity - Schedule of Dividends Paid Previously or Declared (Details) (USD $)	3 Months Ended					12 Months Ended	0 Months Ended	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2012	Apr. 09, 2013 Subsequent Event [Member]	Apr. 09, 2013 Subsequent Event [Member]
Stockholders' Equity Note [Abstract]
Dividends paid per share	$ 0.10	$ 0.21	$ 0.19	$ 0.17	$ 0.17	$ 1.24
Supplemental dividend paid per share		$ 0.50
Subsequent Event [Line Items]
Dividend declared per share							$ 0.20
Dividend paid previously or declared, per share								$ 0.30

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- Definition

Common Stock Dividends Per Share Cash Paid And Or Declared

+ References

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- Definition

Supplemental dividend paid during the period for each share of common stock outstanding.

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- Definition

Aggregate dividends paid 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

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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

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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

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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