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Common Stock Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Oct. 27, 2016 | Feb. 28, 2015
Class of Stock [Line Items] |  |  |  |  |  |
Dividends paid |  | $ 205,468 | $ 104,628 | $ 104,840 |  |
Amount paid for repurchase of common stock |  | $ 83,593 | $ 53,043 | $ 26,881 |  |
Common Class B [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of shares authorized under share repurchase program |  |  |  |  | 4,000,000 | 4,000,000
Remaining number of shares authorized to be repurchased | 3,900,000 | 3,900,000 |  |  |  |
Treasury Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Repurchased shares |  | 3,053,204 | 1,696,457 | 940,417 |  |
SpecialDividend [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Dividends paid | $ 102,200 |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 1.00 |  |  |  |  |

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