Represents the distributions paid as percentage ordinary income by the entity.

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- Definition

Represents the distributions paid expressed as a percentage of qualified dividend by the entity.

+ References

No definition available.

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- Definition

Represents the distributions paid expressed as a percentage of return of capital by the entity.

+ References

No definition available.

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- Definition

Preferred Stock Aggregate Liquidation Preference.

+ 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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- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

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

+ References

No definition available.

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- Definition

The amount per share used to calculated dividend payments on preferred stock.

+ References

No definition available.

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- Definition

The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

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-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 Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph d

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-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(d)(1))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section S99

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=27010884&loc=d3e42851-122695

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- Definition

The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

+ References

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Shareholders' Equity (Details 3) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 12, 2015
Shareholders' Equity
Reduced net income available for common shareholders on the excess of liquidation preference of the redeemed shares over carrying amount		$ 5,627us-gaap_PreferredStockRedemptionPremium	$ 7,984us-gaap_PreferredStockRedemptionPremium
Common Share Distributions
Cash distributions paid or payable (in dollars)	292,029us-gaap_PaymentsOfDividendsCommonStock	256,587us-gaap_PaymentsOfDividendsCommonStock	224,899us-gaap_PaymentsOfDividendsCommonStock
Series D
Shareholders' Equity
Dividend rate (as a percent)	7.125%
Liquidation preference (in dollars per share)	$ 25.00
Distribution rate (in dollars per share)	$ 1.78125
Aggregate liquidation preference (in dollars)	290,000	290,000
Redemption price per share (in dollars per share)	$ 25.00
Common Shares
Common Share Distributions
Distributions paid as percentage of ordinary income	100.00%	95.90%	100.00%
Distributions paid as a percentage of return of capital		2.95%
Distributions paid as a percentage of qualified dividend		1.15%
Cash distributions paid or payable (in dollars per share)	$ 1.95	$ 1.89	$ 1.82
Cash distributions paid or payable (in dollars)	$ 292,029	$ 256,587	$ 224,899
Common Shares \| Subsequent event
Common Share Distributions
Cash distributions paid or payable (in dollars per share)				$ 0.49