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Taxes on Income, Earnings Before Taxes (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Taxes on Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings before taxes on income - United States | $ 80,115,000 | $ 90,623,000 | $ 93,072,000 | $ 97,902,000 | $ 108,783,000 | $ 122,928,000 | $ 121,679,000 | $ 101,000,000 | $ 361,712,000 | $ 454,390,000 | $ 408,678,000
Federal [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 64,707,000 | 81,953,000 | 41,008,000
Deferred |  |  |  |  |  |  |  |  | 59,582,000 | 72,920,000 | 97,586,000
State and local |  |  |  |  |  |  |  |  | 9,453,000 | 14,909,000 | 13,785,000
Total provision for taxes on income | $ 29,043,000 | $ 33,512,000 | $ 34,696,000 | $ 36,491,000 | $ 40,310,000 | $ 45,715,000 | $ 45,768,000 | $ 37,989,000 | 133,742,000 | 169,782,000 | 152,379,000
Tax benefit realized from equity compensation plans |  |  |  |  |  |  |  |  | $ 964,000 | $ 6,119,000 | $ 3,001,000

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