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Income taxes (Tables) | 3 Months Ended
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Mar. 31, 2016
Activities Related to Unrecognized Tax Benefits for Uncertain Tax Positions | The following table summarizes activities related to the Company’s unrecognized tax benefits for uncertain tax positions from January 1, 2016 to March 31, 2016:
|  | 2016 |
Opening Balance at January 1 |  | $ | 26,357 |
Increase related to prior year tax positions, including recorded in acquisition accounting |  |  | 13 |
Decrease related to prior year tax positions |  |  | (764 | )
Decrease related to prior year tax position due to lapse of applicable statute of limitation |  |  | (166 | )
Decrease related to settlements with tax authorities |  |  | (2,000 | )
Effect of exchange rate changes |  |  | 119 |
Closing Balance at March 31 |  | $ | 23,559 |

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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=51663037&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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