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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

X

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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