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Commitments and contingencies (Details 2) $ in Thousands | 12 Months Ended
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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

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