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Shareholders' Equity (Details) - $ / shares | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |
Preferred stock, shares authorized | 50,000,000 | 50,000,000 | 50,000,000
Preferred stock, par value | $ 0.01 | $ 0.01 | $ 0.01
Preferred stock, shares issued | 5,941,659 | 5,941,659 | 5,888,680
Preferred Stock, Liquidation Preference Per Share | $ 25.00 | $ 25.00 |
Preferred Stock, Dividend Payment Terms |  | The Series A Preferred Stock pays a cumulative cash dividend equivalent to 8.50% of the $25.00 liquidation preference per share each year and the Series B Preferred Stock pays a cumulative cash dividend equivalent to 7.625% of the $25.00 liquidation preference per share each year. |
Dividends declared per common share | $ 0.18 |  |
Series A Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares authorized | 8,000,000 | 8,000,000 |
Preferred stock, shares issued | 2,300,000 | 2,300,000 | 2,300,000
Preferred Stock, Dividend Rate, Percentage |  | 8.50% |
Series B Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares authorized | 7,000,000 | 7,000,000 |
Preferred stock, shares issued | 3,641,659 | 3,641,659 | 3,588,680
Preferred Stock, Dividend Rate, Percentage |  | 7.625% |
Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends Payable, Date to be Paid | Oct. 15, 2018 |  |
Dividends Payable, Date of Record | Oct. 01, 2018 |  |
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends Payable, Date to be Paid | Oct. 31, 2018 |  |
Dividends Payable, Date of Record | Oct. 03, 2018 |  |

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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 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 + 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=84159872&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=84159872&loc=d3e21484-112644 Reference 3: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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 5: 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 + Details
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