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Equity - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Series C Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred Stock, Shares Issued | 3,000,000 | 3,000,000
Preferred stock, par value | $ 25 | $ 25
Payments of Stock Issuance Costs | $ 1.6 |
Preferred Stock, Shares Outstanding | 3,000,000 | 3,000,000
Series B Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred Stock, Shares Issued | 3,000,000 | 3,000,000
Preferred Stock, Dividend Rate, Percentage | 6.875% |
Preferred stock, par value | $ 25 | $ 25
Payments of Stock Issuance Costs | $ 1.9 |
Preferred Stock, Shares Outstanding | 3,000,000 | 3,000,000
Series A Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred Stock, Shares Issued | 2,400,000 | 2,400,000
Preferred Stock, Dividend Rate, Percentage | 5.875% |
Preferred stock, par value | $ 25 | $ 25
Preferred Stock, Liquidation Preference Per Share | $ 25 |
Payments of Stock Issuance Costs | $ 1.7 |
Preferred Stock, Shares Outstanding | 2,400,000 | 2,400,000
July 17, 2024, thereafter [Member] | Series C Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred Stock, Dividend Variable Rate, Percentage | 3.26% |
Up to but excluding July 17, 2024 [Member] | Series C Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred Stock, Dividend Rate, Percentage | 6.00% |

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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + 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 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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