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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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Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP).

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