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Taxes on Income (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2017
Dec. 31, 2020
Income Taxes [Abstract]              
Effective income tax rate       21.00%   35.00%  
Income tax receivable $ 70,528,000     $ 70,528,000     $ 188,177,000
Tax refund amount   $ 119,493,000          
Loss before taxes on income [Abstract]              
Earnings (loss) before taxes on income 15,845,000   $ 23,834,000 11,834,000 $ (495,938,000)    
U.S. Federal [Abstract]              
Current 0   (18,608,000) 0 (156,304,000)    
Deferred 3,407,000   16,149,000 2,804,000 (7,294,000)    
U.S. State and local [Abstract]              
Current 573,000   536,000 215,000 618,000    
Deferred 1,506,000   505,000 1,576,000 (11,294,000)    
Foreign - current 7,000   (11,000) 7,000 36,000    
Total provision (benefit) for taxes on income 5,493,000   (1,429,000) $ 4,602,000 (174,238,000)    
COVID-19 [Member]              
Income Taxes [Abstract]              
Operating losses tax year       2013 2014 2015 2016 2017      
Tax benefit related to CARES Act         50,824,000    
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 15,811,000   23,861,000 $ 12,192,000 (495,628,000)    
Foreign [Member]              
Loss before taxes on income [Abstract]              
Earnings (loss) before taxes on income $ 34,000   $ (27,000) $ (358,000) $ (310,000)