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Taxes on Income (Earnings Before Taxes) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Taxes on Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings before taxes on income - United States | $ 108,783 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 122,928 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 121,679 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 101,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 102,905 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 111,703 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 102,134 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 91,936 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 454,390 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 408,678 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 340,526 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Federal [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 81,953 us-gaap_CurrentFederalTaxExpenseBenefit | 41,008 us-gaap_CurrentFederalTaxExpenseBenefit | 41,297 us-gaap_CurrentFederalTaxExpenseBenefit
Deferred |  |  |  |  |  |  |  |  | 72,920 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 97,586 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 71,767 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and local |  |  |  |  |  |  |  |  | 14,909 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 13,785 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 14,843 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total provision for taxes on income | $ 40,310 us-gaap_IncomeTaxExpenseBenefit | $ 45,715 us-gaap_IncomeTaxExpenseBenefit | $ 45,768 us-gaap_IncomeTaxExpenseBenefit | $ 37,989 us-gaap_IncomeTaxExpenseBenefit | $ 37,646 us-gaap_IncomeTaxExpenseBenefit | $ 42,007 us-gaap_IncomeTaxExpenseBenefit | $ 38,342 us-gaap_IncomeTaxExpenseBenefit | $ 34,384 us-gaap_IncomeTaxExpenseBenefit | $ 169,782 us-gaap_IncomeTaxExpenseBenefit | $ 152,379 us-gaap_IncomeTaxExpenseBenefit | $ 127,907 us-gaap_IncomeTaxExpenseBenefit

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