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Shareholders' Equity - Share Repurchase Program (Details) - Class A common shares - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 21, 2015
Class of Stock [Line Items] |  |  |
Repurchase of Class A common stock, authorized amount |  |  | $ 300,000,000
Weighted-average price of shares (in dollars per share) | $ 15.44 | $ 15.76 |
Total cost of Class A common shares | $ 96,000,000 | $ 57,300,000 |
Remaining repurchase authorization amount | $ 146,700,000 |  |
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Repurchase and retire of Class A common shares (in shares) | 6,215,656 | 3,633,602 |

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