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Common Stock Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 28, 2015 | Dec. 31, 2008
Class of Stock [Line Items] |  |  |  |  |
Dividends paid | $ 104,628 | $ 104,840 | $ 102,515 |  |
Amount paid for repurchase of common stock | $ 53,043 | 26,881 | $ 14,186 |  |
Retirement of treasury stock |  | $ 0 |  |  |
Common Class B [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares authorized under share repurchase program |  |  |  | 4,000,000 | 5,000,000
Remaining number of shares authorized to be repurchased | 2,800,000 |  |  |  |
Treasury Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Repurchased shares | 1,696,457 | 940,417 | 645,343 |  |
Retirement of treasury stock, shares |  | (20,000,000) |  |  |
Treasury Stock Value [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Amount paid for repurchase of common stock | $ 53,043 | $ 26,881 | $ 14,186 |  |
Retirement of treasury stock |  | 587,268 |  |  |
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Retirement of treasury stock |  | (49,200) |  |  |
Retained Earnings [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Retirement of treasury stock |  | $ (538,068) |  |  |

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