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Shareholders' Equity Shareholders' Equity (Details 6) - Class A common shares - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Sep. 21, 2015
Class of Stock |  |
Repurchase of Class A common stock, authorized amount |  | $ 300,000,000
Average price per share of Class A common shares | $ 15.76 |
Total cost of Class A common shares repurchase | $ 53,679,000 |
Remaining repurchase authorization | $ 246,300,000 |
Common Stock |  |
Class of Stock |  |
Repurchases of Class A common shares (in shares) | 3,407,046 |

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