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Accumulated other comprehensive income (loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated other comprehensive income (loss) | AOCI consists of the following balances, net of tax:
| Foreign currency cumulative translation |  | Unrealized gain on cash flow hedges |  | Net change on available-for-sale investments |  | Pension and post-employment actuarial changes |  | Total
Balance, January 1, 2016 | $ | 261,357 |  |  | $ | 39,329 |  |  | $ | (72 | ) |  | $ | (13,877 | ) |  | $ | 286,737 |
OCI (loss) before reclassifications | (61,029 | ) |  | 34,308 |  |  | 213 |  |  | 2,856 |  |  | (23,652 | )
Amounts reclassified | — |  |  | (7,554 | ) |  | — |  |  | (604 | ) |  | (8,158 | )
Net current period OCI | (61,029 | ) |  | 26,754 |  |  | 213 |  |  | 2,252 |  |  | (31,810 | )
Balance, December 31, 2016 | $ | 200,328 |  |  | $ | 66,083 |  |  | $ | 141 |  |  | $ | (11,625 | ) |  | $ | 254,927 |
OCI before reclassifications | (200,400 | ) |  | 8,714 |  |  | — |  |  | 838 |  |  | (190,848 | )
Amounts reclassified | — |  |  | (6,805 | ) |  | (141 | ) | — |  | (313 | ) |  | (7,259 | )
Net current period OCI | $ | (200,400 | ) |  | $ | 1,909 |  |  | $ | (141 | ) |  | $ | 525 |  |  | $ | (198,107 | )
Balance, December 31, 2017 | $ | (72 | ) |  | $ | 67,992 |  |  | $ | — |  |  | $ | (11,100 | ) |  | $ | 56,820 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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