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Shareholders' Equity - At the Market Common Share Offering Program (Details) - USD ($) $ / shares in Units, shares in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Nov. 30, 2016
Class of Stock [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 |  |  |
Class of Stock [Line Items] |  |  |
Shares available for future issuance, value | $ 276,600,000 |  | $ 400,000,000
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 |  |

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