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Taxes on Income (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2017
Income Taxes [Abstract]
Effective income tax rate			21.00%		35.00%
Tax refund amount	$ (30,606,000)		$ (30,606,000)
Income tax receivable	159,557,000		159,557,000
Earnings (loss) before taxes on income [Abstract]
Earnings (loss) before taxes on income	19,274,000	$ 64,455,000	(476,664,000)	$ 185,501,000
Federal [Abstract]
Current	(33,690,000)	0	(189,994,000)	0
Deferred	23,350,000	14,495,000	16,056,000	40,502,000
State and local [Abstract]
Current	1,257,000	1,675,000	1,875,000	4,820,000
Deferred	620,000	0	(10,674,000)	0
Foreign - current	44,000	135,000	80,000	132,000
Total Provision (benefit) for taxes on income	(8,419,000)	16,305,000	$ (182,657,000)	45,454,000
COVID-19 [Member]
Income Taxes [Abstract]
Operating losses tax year			2013 2014 2015 2016 2017
Tax benefit related to CARES Act			$ (58,746,000)
Decrease in deferred tax asset			$ (89,358,000)
COVID-19 [Member] | Maximum [Member]
Income Taxes [Abstract]
Number of years net operating losses carried			5 years
United States [Member]
Earnings (loss) before taxes on income [Abstract]
Earnings (loss) before taxes on income	19,246,000	64,550,000	$ (476,382,000)	186,205,000
Foreign [Member]
Earnings (loss) before taxes on income [Abstract]
Earnings (loss) before taxes on income	$ 28,000	$ (95,000)	$ (282,000)	$ (704,000)

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