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Events after the reporting period (Details) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 29, 2020
Dec. 31, 2019
Apr. 02, 2020
Dec. 31, 2018
Disclosure of Subsequent Event [Line Items]        
Deferred income tax liability, net   $ 28,959,000   $ 31,422,000
Income tax, fines   $ 29,000,000    
Syndicated Term Loan [Member]        
Disclosure of Subsequent Event [Line Items]        
Term loan interest rate is equal to LIBOR plus     1.90%  
Loan payable in semi-annual installment     $ 41,250,000  
Loan payable in final payment     $ 68,750,000  
Commencement of major litigation [member]        
Disclosure of Subsequent Event [Line Items]        
Deferred income tax liability, net $ 8,000,000      
Income tax for interest expense 16,800,000      
Income tax, fines $ 4,000,000