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Subsequent Events - Share Issuances (Details) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 03, 2017 shares | Sep. 30, 2017 shares | Sep. 30, 2016 | Sep. 30, 2017 shares | Dec. 31, 2016 shares
Subsequent Event [Line Items] |  |  |  |  |
Preferred shares, shares outstanding (in shares) |  | 47,810,000 |  | 47,810,000 | 37,010,000
5.0% Series A Participating Preferred Shares |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 5.00% | 5.00% | 5.00% |
5.0% Series B Participating Preferred Shares |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 5.00% | 5.00% | 5.00% |
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Issuance of perpetual preferred shares, net of offering costs (in shares) | 12,398,276 |  |  |  |
Class A conversion ratio | 1.3106 |  |  |  |
Subsequent Event | 5.0% Series A Participating Preferred Shares |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Preferred shares, shares outstanding (in shares) | 5,060,000 |  |  |  |
Preferred stock, dividend rate, percentage | 5.00% |  |  |  |
Subsequent Event | 5.0% Series B Participating Preferred Shares |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Preferred shares, shares outstanding (in shares) | 4,400,000 |  |  |  |
Preferred stock, dividend rate, percentage | 5.00% |  |  |  |

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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: 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 + Details
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- Definition The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: 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 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(29)) -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 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 5: 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 + Details
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