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Commitments and contingencies (Details 2)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses $ 256,555
Tax Assesment, Penalties Expense 350,973
Tax Assesments, penalties and interest expenses 607,528
Year 2003 - 2005 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 12,220
Tax Assesment, Penalties Expense 46,710
Tax Assesments, penalties and interest expenses 58,930
Year 2006 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 10,990
Tax Assesment, Penalties Expense 51,938
Tax Assesments, penalties and interest expenses 62,928
Year 2007 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 12,376
Tax Assesment, Penalties Expense 17,845
Tax Assesments, penalties and interest expenses 30,221
Year 2008 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 20,797
Tax Assesment, Penalties Expense 12,968
Tax Assesments, penalties and interest expenses 33,765
Year 2009 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 56,388
Tax Assesment, Penalties Expense 51,219
Tax Assesments, penalties and interest expenses 107,607
Year 2010 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 62,581
Tax Assesment, Penalties Expense 105,225
Tax Assesments, penalties and interest expenses 167,806
Year 2011 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 49,055
Tax Assesment, Penalties Expense 65,068
Tax Assesments, penalties and interest expenses 114,123
Year 2014 - 2017 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 32,148
Tax Assesment, Penalties Expense 0
Tax Assesments, penalties and interest expenses $ 32,148