Noncontrolling Interests (Preferred Stockholders' Equity in Subsidiaries) (Details) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	25.00%
Noncontrolling Interest, Ownership Percentage by Parent	75.00%
Preferred Stock, Dividend Rate, Percentage	4.00%	4.00%
Preferred Stock, Cumulative Dividend Increase Interval if Outstanding Once Callable	6 months
Dividends in arrears	$ 0	$ 0
Redeemable Preferred Stock Member
Noncontrolling Interest [Line Items]
Shares, Outstanding	300,000
Preferred Stock, Value, Issued	$ 300,000,000
Preferred Stock, Dividend Rate, Percentage	6.125%
Preferred Stock, Dividend Rate, Increase if Outstanding Once Callable	50.00%
Preferred stock-perpetual voting, dividend increase percentage each interval once shares become callable	50.00%

Rate of increase of Preferred Stock dividend if Preferred Stock is not called in 2016.

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- Definition

Interval at which the Preferred Stock dividend will increase if Preferred Stock is not called in 2016.

+ References

No definition available.

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- Definition

Noncontrolling Interest, Preferred Stock, Shares

+ References

No definition available.

+ Details

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- Definition

Preferred Stock, Dividend Rate, Increase if Outstanding Once Callable

+ References

No definition available.

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- Definition

The amount of noncontrolling interest in subsidiary represented by preferred securities issued by the subsidiary.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.31)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 27

-Article 5

+ Details

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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- Definition

Aggregate amount of cumulative preferred dividends in arrears.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

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- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

+ Details

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