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Commitments and contingencies (Details 2)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses $ 252,624
Tax Assesment, Penalties Expense 364,466
Tax Assesments, penalties and interest expenses 617,090
Year 2003 - 2005 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 15,909
Tax Assesment, Penalties Expense 54,053
Tax Assesments, penalties and interest expenses 69,962
Year 2006 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 6,545
Tax Assesment, Penalties Expense 59,454
Tax Assesments, penalties and interest expenses 65,999
Year 2007 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 12,376
Tax Assesment, Penalties Expense 17,809
Tax Assesments, penalties and interest expenses 30,185
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 58,495
Tax Assesment, Penalties Expense 49,112
Tax Assesments, penalties and interest expenses 107,607
Year 2010 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 65,997
Tax Assesment, Penalties Expense 107,139
Tax Assesments, penalties and interest expenses 173,136
Year 2011 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 49,055
Tax Assesment, Penalties Expense 63,931
Tax Assesments, penalties and interest expenses 112,986
Year 2014 - 2017 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 23,450
Tax Assesment, Penalties Expense 0
Tax Assesments, penalties and interest expenses $ 23,450