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Subsequent Events - Share Issuances (Details) - USD ($) $ / shares in Units, shares in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Nov. 30, 2016
Subsequent Event [Line Items] |  |  |  |
Proceeds from issuance of shares |  | $ 355,589,000 | $ 2,000 |
Stock issuance costs |  | $ 350,000 | $ 0 |
At the Market - Common Share Offering Program | Class A common shares |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Shares issued during period (in shares) |  | 0.9 |  |
Proceeds from issuance of shares |  | $ 19,400,000 |  |
Shares issued, price per share (in dollars per share) |  | $ 22.75 |  |
Proceeds from issuance of common stock, net of issuance costs |  | $ 19,100,000 |  |
Stock issuance costs |  | 300,000 |  |
Shares available for future issuance, value |  | $ 276,600,000 |  | $ 400,000,000
Subsequent Event | At the Market - Common Share Offering Program |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Proceeds from issuance of shares | $ 26,900,000 |  |  |
Shares issued, price per share (in dollars per share) | $ 22.73 |  |  |
Proceeds from issuance of common stock, net of issuance costs | $ 26,500,000 |  |  |
Stock issuance costs | 400,000 |  |  |
Shares available for future issuance, value | $ 249,800,000 |  |  |
Subsequent Event | At the Market - Common Share Offering Program | Class A common shares |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Shares issued during period (in shares) | 1.2 |  |  |

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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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