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Taxes on Income (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2017
Earnings (loss) before taxes on income [Abstract]
Earnings (loss) before taxes on income	$ (519,772,000)	$ 58,337,000
Federal [Abstract]
Current	(137,696,000)	0
Deferred	(23,443,000)	12,490,000
State and local [Abstract]
Current	82,000	1,459,000
Deferred	(11,799,000)	0
Foreign - current	47,000	(69,000)
Total Provision for taxes on income	$ (172,809,000)	13,880,000
Effective income tax rate	21.00%		35.00%
COVID-19 [Member]
State and local [Abstract]
Operating losses tax year	2013 2014 2015 2016 2017
Decrease in deferred tax asset	$ (77,262,000)
Tax benefit related to CARES Act	$ (50,284,000)
COVID-19 [Member] | Maximum [Member]
State and local [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	$ (519,489,000)	58,752,000
Foreign [Member]
Earnings (loss) before taxes on income [Abstract]
Earnings (loss) before taxes on income	$ (283,000)	$ (415,000)

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