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Taxes on Income, Earnings Before Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Earnings (loss) before taxes on income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) before taxes on income | $ (30,292) | $ 57,066 | $ 44,854 | $ 42,531 | $ (58,860) | $ 47,861 | $ 43,015 | $ 40,998 | $ 114,159 | $ 73,014 | $ 227,746
U.S. Federal [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 0 | 11,143 | 28,919
Deferred |  |  |  |  |  |  |  |  | 27,102 | (258,703) | 49,685
Total U.S. Federal |  |  |  |  |  |  |  |  | 27,102 | (247,560) | 78,604
U.S. State [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | (243) | 3,861 | 4,727
Deferred |  |  |  |  |  |  |  |  | 7,619 | 2,280 | 1,611
Total U.S. State |  |  |  |  |  |  |  |  | 7,376 | 6,141 | 6,338
Foreign [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 443 | 370 | 0
Deferred |  |  |  |  |  |  |  |  | 160 | 160 | 0
Total Foreign |  |  |  |  |  |  |  |  | 603 | 530 | 0
Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 200 | 15,374 | 33,646
Deferred |  |  |  |  |  |  |  |  | 34,881 | (256,263) | 51,296
Total Provision (benefit) for taxes on income | $ (5,961) | $ 15,116 | $ 16,061 | $ 9,865 | $ (290,357) | $ 19,072 | $ 17,043 | $ 13,353 | 35,081 | (240,889) | 84,942
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) before taxes on income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) before taxes on income |  |  |  |  |  |  |  |  | 117,800 | 74,267 | 227,746
Foreign [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) before taxes on income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) before taxes on income |  |  |  |  |  |  |  |  | $ (3,641) | $ (1,253) | $ 0

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