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Equity - 8.375% Series B Cumulative Redeemable Preferred Stock Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 10, 2015 | Jan. 20, 2015 | Jan. 23, 2012 | Dec. 31, 2010 | Jun. 30, 2015 | Dec. 31, 2014
Class of Stock |  |  |  |  |  |
Proceeds from sale of common stock (in shares) | 6,037,500 | 11,000,000 |  |  |  |
Public Offering, Exercise of Over-allotment Option |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Proceeds from sale of common stock (in shares) |  | 1,650,000 |  |  |  |
Series B Preferred Stock |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Interest rate of preferred stock |  |  |  |  | 8.375% | 8.375%
Shares outstanding of preferred stock |  |  |  |  | 5,800,000 | 5,800,000
Series B Cumulative Redeemable Preferred Stock, Liquidation Preference Per Share |  |  |  |  | $ 25 | $ 25
Par value of preferred stock |  |  |  |  | 0.01 | $ 0.01
Liquidation preference of preferred stock, per annum (dollars per share) |  |  |  |  | $ 2.0938 |
Preferred stock, redemption period after change in control |  |  |  |  | 90 days |
Series B Preferred Stock | Change of Control |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Interest rate of preferred stock |  |  |  |  | 12.375% |
Liquidation preference of preferred stock, per annum (dollars per share) |  |  |  |  | $ 3.09375 |
Series B Preferred Stock | Public Offering |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Proceeds from sale of common stock (in shares) |  |  | 2,300,000 | 3,500,000 |  |
Proceeds from the offering before transaction costs |  |  | $ 57.5 | $ 83.9 |  |
Series B Preferred Stock | Public Offering, Exercise of Over-allotment Option |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Proceeds from sale of common stock (in shares) |  |  | 300,000 | 300,000 |  |

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- Definition Proceeds from Issuance of Redeemable Preferred Stock, Net of Issuance Costs, Before Transaction Costs + References No definition available. + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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