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Taxes on Income (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2017
Dec. 31, 2020
Income Taxes [Abstract]              
Effective income tax rate       21.00%   35.00%  
Income tax receivable $ 70,959,000     $ 70,959,000     $ 188,177,000
Tax refund amount   $ 119,493,000          
Loss before taxes on income [Abstract]              
Earnings (loss) before taxes on income (325,594,000)   $ 19,274,000 (313,760,000) $ (476,664,000)    
U.S. Federal [Abstract]              
Current (446,000)   (33,690,000) (446,000) (189,994,000)    
Deferred (55,772,000)   23,350,000 (52,968,000) 16,056,000    
U.S. State and local [Abstract]              
Current 832,000   1,257,000 1,047,000 1,875,000    
Deferred (5,056,000)   620,000 (3,480,000) (10,674,000)    
Foreign - current 0   44,000 7,000 80,000    
Total provision (benefit) for taxes on income (60,442,000)   (8,419,000) $ (55,840,000) (182,657,000)    
COVID-19 [Member]              
Income Taxes [Abstract]              
Operating losses tax year       2013 2014 2015 2016 2017      
Tax benefit related to CARES Act       $ 58,746,000      
COVID-19 [Member] | Maximum [Member]              
Income Taxes [Abstract]              
Number of years net operating losses carried       5 years      
United States [Member]              
Loss before taxes on income [Abstract]              
Earnings (loss) before taxes on income (325,369,000)   19,246,000 $ (313,177,000) (476,382,000)    
Foreign [Member]              
Loss before taxes on income [Abstract]              
Earnings (loss) before taxes on income $ (225,000)   $ 28,000 $ (583,000) $ (282,000)