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Equity (Details) - USD ($) $ in Thousands, shares in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Oct. 27, 2016 | Feb. 28, 2015
Purchase of treasury stock | $ 64,101 | $ 36,845 |  |
Treasury Stock [Member] |  |  |  |
Purchase of treasury stock | $ 64,101 | $ 36,845 |  |
Class B [Member] |  |  |  |
Number of shares authorized under share repurchase program |  |  | 4.0 | 4.0
Repurchased shares | 2.3 |  |  |
Remaining number of shares authorized to be repurchased | 0.6 |  |  |
SharesRepurchasedInOpenMarket [Member] | Class B [Member] |  |  |  |
Repurchased shares | 2.2 |  |  |

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