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Taxes on Income, Earnings Before Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Taxes on Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings before taxes on income - United States | $ 52,370 | $ 51,559 | $ 62,474 | $ 61,343 | $ 80,115 | $ 90,623 | $ 93,072 | $ 97,902 | $ 227,746 | $ 361,712 | $ 454,390
Federal [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 28,919 | 64,707 | 81,953
Deferred |  |  |  |  |  |  |  |  | 49,685 | 59,582 | 72,920
State and local |  |  |  |  |  |  |  |  | 6,338 | 9,453 | 14,909
Total provision for taxes on income | $ 19,512 | $ 19,206 | $ 23,365 | $ 22,859 | $ 29,043 | $ 33,512 | $ 34,696 | $ 36,491 | 84,942 | 133,742 | 169,782
Tax benefit (expense) realized from equity compensation plans |  |  |  |  |  |  |  |  | $ (824) | $ 964 | $ 6,119

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