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Shareholders' Equity - At the Market Common Share Offering Program (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Nov. 30, 2016
Class of Stock [Line Items] |  |  |  |  |
Proceeds from issuance of Class A common shares |  | $ 102,830,000 | $ 0 | $ 308,435,000 |
Class A common shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common shares, shares issued (in shares) |  | 242,740,482 | 207,235,510 |  |
Proceeds from issuance of Class A common shares | $ 313,300,000 |  |  |  |
Stock issuance costs | $ 4,900,000 | $ 227,000 | $ 0 | $ 0 |
At the Market - Common Share Offering Program | Class A common shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common shares, shares issued (in shares) |  | 4,900,000 |  |  |
Proceeds from issuance of Class A common shares |  | $ 104,000,000 |  |  |
Sale of stock, price per share (in dollars per share) |  | $ 21.13 |  |  |
Proceeds from sale of stock, net of issuance costs |  | $ 102,800,000 |  |  |
Stock issuance costs |  | 1,200,000 |  |  |
Shares reserved for future issuance |  |  |  |  | $ 400,000,000.0
Remaining available for future shares |  | $ 296,000,000 |  |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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