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Equity (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Feb. 28, 2015
Amount paid for repurchase of common stock | $ 13,720 | $ 9,948 |
Class B [Member] |  |  |
Number of shares authorized under share repurchase program |  |  | 4.0
Repurchased shares | 1.0 |  |
Remaining number of shares authorized to be repurchased | 2.2 |  |

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