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Shareholders' equity (Details) (USD $)	3 Months Ended				1 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Accounts payable and accrued expenses	Mar. 31, 2014 Amounts payable to affiliates	Mar. 31, 2014 Series C Convertible Units	Mar. 31, 2014 Class A Common Shares	Mar. 31, 2014 Series A Participating Preferred Shares	Feb. 28, 2014 Series A Participating Preferred Shares	Mar. 31, 2014 Series B Participating Preferred Shares	Feb. 28, 2014 Series B Participating Preferred Shares
Class of Stock
Dividend payable per share				$ 0.15113	$ 0.05		$ 0.3125		$ 0.35
Dividend payable date					Apr. 10, 2014
Dividend record date					Mar. 25, 2014
Dividend payable, amount		$ 8,900,000	$ 400,000	$ 4,500,000
Preferred Shares dividend rate							5.00%		5.00%
Quarterly distributions to preferred shareholders	$ 3,121,000					$ 1,600,000		$ 1,500,000

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

-URI http://asc.fasb.org/extlink&oid=6509677



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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



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-Topic 230

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

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