Authorized but Unissued Preferred Shares

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- Definition

Common Stock, Converted from Common Unit

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- Definition

Common Unit, Convertible to Common Stock

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- Definition

Preferred Units, Annual Cash Distributions

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- Definition

Preferred Units Total Annual Cash Distributions

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- Definition

The cash outflow to reacquire preferred stock during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

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- Definition

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

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- Definition

The excess of (1) the carrying amount of the preferred stock in the registrant's balance sheet over (2) the fair value of the consideration transferred to the holders of the preferred stock, during the accounting period, which will be added to net earnings to arrive at net earnings available to common shareholders in the calculation of earnings per share.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section S99

-Paragraph 2

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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.

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- Definition

The number of preferred units outstanding.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section F

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- Definition

The fair value as of the reporting date of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of common shares (regardless of class), limited partnership units (regardless of class), non-preferential membership interests, or any other form of common equity regardless of investee entity legal form.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph 14

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-Topic 480

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-Subparagraph (16)(c)

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- Definition

Equity impact of the value of stock bought back by the entity at the exercise price or redemption price.

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-Name Accounting Standards Codification

-Topic 505

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Shareholders' Equity - Common and Preferred Units (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Preferred Units [Line Items]
Market value of outstanding limited partners' common units as of December 31, 2014			$ 133,700,000
Preferred Units Description and Other Disclosures [Abstract]
Preferred Stock Redemption Premium	1,236,000us-gaap_PreferredStockRedemptionPremium
Preferred Stock Redemption Discount		3,689,000
Preferred Units, Total Annual Cash Distributions	1,600,000.0	9,900,000.0
Authorized but Unissued Preferred Shares			16,013,000
Preferred Units, Outstanding			0us-gaap_PreferredUnitsOutstanding
Conversion Ratio of Common Units to Common Shares [Member]
Preferred Units [Line Items]
Common Unit, Convertible to Common Stock			1
Common Stock, Converted from Common Unit			1
Series B Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Stock Redeemed or Called During Period, Value		95,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount		7.45%
Preferred Units, Annual Cash Distributions	$ 0	$ 0.45
Series E Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Stock Redeemed or Called During Period, Value	20,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount	7.00%
Preferred Units, Annual Cash Distributions	$ 1.21	$ 3.50
Series F Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Stock Redeemed or Called During Period, Value	17,500,000	32,500,000
Payments for Repurchase of Preferred Stock and Preference Stock		26,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount	6.65%	6.65%
Preferred Units, Annual Cash Distributions	$ 1.32	$ 1.43
Series G Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Stock Redeemed or Called During Period, Value	27,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount	6.70%
Preferred Units, Annual Cash Distributions	$ 1.33	$ 3.35
Series H Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Stock Redeemed or Called During Period, Value		$ 100,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount		7.40%
Preferred Units, Annual Cash Distributions	$ 0	$ 0.77