Fair value of financial instruments (Tables)
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Dec. 31, 2013
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Fair Value Disclosures [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] | Financial assets and liabilities measured at fair value on a recurring basis are summarized below and disclosed on the consolidated balance sheets as of December 31, 2013:
Financial assets and liabilities measured at fair value on a recurring basis are summarized below and disclosed on the consolidated balance sheets as of December 31, 2012:
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | The table below provides a summary of the changes in fair value, including net transfers in and/or out, of all financial assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the year ending December 31, 2013:
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