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Commitments and contingencies - Summary of assessments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses $ 294,610
Tax Assessments Penalties And Interest Expense 442,302
Total 736,912
Year 2003 - 2005 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 8,780
Tax Assessments Penalties And Interest Expense 39,700
Total 48,480
Year 2006 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 11,206
Tax Assessments Penalties And Interest Expense 51,769
Total 62,975
Year 2007 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 12,821
Tax Assessments Penalties And Interest Expense 21,177
Total 33,998
Year 2008 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 16,906
Tax Assessments Penalties And Interest Expense 16,859
Total 33,765
Year 2009 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 56,000
Tax Assessments Penalties And Interest Expense 51,606
Total 107,606
Year 2010 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 53,700
Tax Assessments Penalties And Interest Expense 117,880
Total 171,580
Year 2011 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 41,063
Tax Assessments Penalties And Interest Expense 67,932
Total 108,995
Year 2012 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 869
Tax Assessments Penalties And Interest Expense 9,477
Total 10,346
Year 2013 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 48,401
Tax Assessments Penalties And Interest Expense 65,902
Total 114,303
Year 2014-2020 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 44,864
Tax Assessments Penalties And Interest Expense 0
Total $ 44,864