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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 $ (391,839,000) $ 58,337,000  
Federal [Abstract]      
Current (137,696,000) 0  
Deferred 2,813,000 12,490,000  
State and local [Abstract]      
Current 82,000 1,459,000  
Deferred (8,895,000) 0  
Foreign - current 47,000 (69,000)  
Total Provision for taxes on income $ (143,649,000) 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 $ (391,556,000) 58,752,000  
Foreign [Member]      
Earnings (loss) before taxes on income [Abstract]      
Earnings (loss) before taxes on income $ (283,000) $ (415,000)