Shareholders' Equity Tax Characteristics of Cash Dividend (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Capital gain	$ 1.61	$ 0.72	$ 1.68
Qualified	$ 0	$ 1.14	$ 0
Return of capital	$ 0.42	$ 0	$ 0
Total cash dividend per common share	$ 2.03	$ 1.86	$ 1.68

Aggregate dividends paid during the period which meet the criteria for treatment as non-taxable return of capital for tax purposes of the shareholder, for each share of common stock outstanding.

No definition available.

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- Definition

Aggregate dividends paid during the period which qualify as capital gains for tax purposes of the shareholder, for each share of common stock outstanding.

+ References

No definition available.

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- Definition

Aggregate dividends paid during the period, for each share of common stock outstanding, which qualify as qualified dividends for shareholder tax purposes.

+ 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

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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