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Derivative financial instruments (Tables) | 3 Months Ended
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Mar. 31, 2016
Aggregate Notional Principal Amounts of Outstanding Derivative Financial Instruments with Related Balance Sheet Exposure | The following table presents the aggregate notional principal amounts of outstanding derivative financial instruments together with the related balance sheet exposure:
|  | Notional principal amounts (note a) |  |  | Balance sheet exposure asset (liability) (note b) |
|  | As of December 31, 2015 |  |  | As of March 31, 2016 |  |  | As of December 31, 2015 |  |  | As of March 31, 2016 |
Foreign exchange forward contracts denominated in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States Dollars (sell) Indian Rupees (buy) |  | $ | 1,139,400 |  |  | $ | 1,122,400 |  |  | $ | (48,197 | ) |  | $ | (31,954 | )
United States Dollars (sell) Mexican Peso (buy) |  |  | 8,520 |  |  |  | 6,570 |  |  |  | (1,163 | ) |  |  | (824 | )
United States Dollars (sell) Philippines Peso (buy) |  |  | 58,500 |  |  |  | 53,075 |  |  |  | (1,387 | ) |  |  | 224 |
Euro (sell) United States Dollars (buy) |  |  | 146,719 |  |  |  | 140,385 |  |  |  | 9,109 |  |  |  | 3,787 |
Euro (sell) Romanian Leu (buy) |  |  | 39,027 |  |  |  | 31,516 |  |  |  | 567 |  |  |  | 1,036 |
Japanese Yen (sell) Chinese Renminbi (buy) |  |  | 62,740 |  |  |  | 61,317 |  |  |  | (1,379 | ) |  |  | (4,765 | )
Pound Sterling (sell) United States Dollars (buy) |  |  | 118,438 |  |  |  | 105,771 |  |  |  | 7,496 |  |  |  | 9,178 |
Australian Dollars (sell) United States Dollars (buy) |  |  | 106,544 |  |  |  | 99,000 |  |  |  | 5,714 |  |  |  | (399 | )
Interest rate swaps (floating to fixed) |  |  | — |  |  |  | 200,000 |  |  |  | — |  |  |  | (1,926 | )
|  |  |  |  |  |  |  |  |  |  | (29,240 | ) |  |  | (25,643 | )
(a) | Notional amounts are key elements of derivative financial instrument agreements but do not represent the amount exchanged by counterparties and do not measure the Company’s exposure to credit or market risks. However, the amounts exchanged are based on the notional amounts and other provisions of the underlying derivative financial instrument agreements.
(b) | Balance sheet exposure is denominated in U.S. dollars and denotes the mark-to-market impact of the derivative financial instruments on the reporting date.
Fair Value of Derivative Instruments and Location in Financial Statements | The fair value of the Company’s derivative instruments and their location in the Company’s financial statements are summarized in the table below:
|  | Cash flow hedges |  |  | Non-designated |
|  | As of December 31, 2015 |  |  | As of March 31, 2016 |  |  | As of December 31, 2015 |  |  | As of March 31, 2016 |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets |  | $ | 17,400 |  |  | $ | 18,164 |  |  | $ | 884 |  |  | $ | 1,872 |
Other assets |  | $ | 12,096 |  |  | $ | 13,431 |  |  | $ | — |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities |  | $ | 34,576 |  |  | $ | 28,510 |  |  | $ | 34 |  |  | $ | 208 |
Other liabilities |  | $ | 25,010 |  |  | $ | 30,392 |  |  | $ | — |  |  | $ | — |
Cash Flow Hedges, Gains (Losses) Recorded as Component of Other Comprehensive Income (Loss) or Other Comprehensive Income | In connection with cash flow hedges, the gains (losses) recorded as a component of other comprehensive income (loss), or OCI, and the related tax effects are summarized below:
|  | Three months ended March 31, |
|  | 2015 |  |  | 2016 |
|  | Before- Tax amount |  |  | Tax (Expense) or Benefit |  |  | Net of tax Amount |  |  | Before- Tax amount |  |  | Tax (Expense) or Benefit |  |  | Net of tax Amount |
Opening balance as of January 1 |  | $ | (66,786 | ) |  | $ | 23,646 |  |  | $ | (43,140 | ) |  | $ | (30,090 | ) |  | $ | 9,830 |  |  | $ | (20,260 | )
Net gains (losses) reclassified into statement of income on completion of hedged transactions |  |  | (9,254 | ) |  |  | 3,251 |  |  |  | (6,003 | ) |  |  | (2,902 | ) |  |  | 702 |  |  |  | (2,200 | )
Changes in fair value of effective portion of outstanding derivatives, net |  |  | 24,564 |  |  |  | (8,734 | ) |  |  | 15,830 |  |  |  | (79 | ) |  |  | (151 | ) |  |  | (230 | )
Gain (loss) on cash flow hedging derivatives, net |  |  | 33,818 |  |  |  | (11,985 | ) |  |  | 21,833 |  |  |  | 2,823 |  |  |  | (853 | ) |  |  | 1,970 |
Closing balance as of March 31 |  | $ | (32,968 | ) |  | $ | 11,661 |  |  | $ | (21,307 | ) |  | $ | (27,267 | ) |  | $ | 8,977 |  |  | $ | (18,290 | )
Gains (Losses) Recorded as Component of Other Comprehensive Income (Loss) or Other Comprehensive Income | The gains or losses recognized in other comprehensive income (loss) and their effects on financial performance are summarized below:
Derivatives in Cash Flow Hedging Relationships |  | Amount of Gain (Loss) recognized in OCI on Derivatives (Effective Portion) |  |  | Location of Gain (Loss) reclassified from OCI into Statement of Income (Effective Portion) |  | Amount of Gain (Loss) reclassified from OCI into Statement of Income (Effective Portion) |  |  | Location of Gain (Loss) recognized in Income on Derivatives (Ineffective Portion and Amount excluded from Effectiveness Testing) |  | Amount of Gain (Loss) recognized in income on Derivatives (Ineffective Portion and Amount excluded from Effectiveness Testing) |
|  | Three months ended March 31, |  |  |  |  | Three months ended March 31, |  |  |  |  | Three months ended March 31, |
|  | 2015 |  |  | 2016 |  |  |  |  | 2015 |  |  | 2016 |  |  |  |  | 2015 |  |  | 2016 |
Forward foreign exchange contracts |  | $ | 24,564 |  |  | $ | 1,847 |  |  | Revenue |  | $ | 2,495 |  |  | $ | 3,871 |  |  | Foreign exchange (gains) losses, net |  | $ | — |  |  | $ | — |
Interest rate swaps |  |  | — |  |  |  | (1,926 | ) |  | Cost of revenue |  |  | (9,427 | ) |  |  | (5,312 | ) |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  | Selling, general and administrative expenses |  |  | (2,322 | ) |  |  | (1,461 | ) |  |  |  |  |  |  |  |  |  |
|  | $ | 24,564 |  |  | $ | (79 | ) |  |  |  | $ | (9,254 | ) |  | $ | (2,902 | ) |  |  |  | $ | — |  |  | $ | — |
Non-designated Hedges
Derivatives not designated as hedging instruments |  | Location of (Gain) Loss recognized in Statement of Income on Derivatives |  | Amount of (Gain) Loss recognized in Statement of Income on Derivatives |
|  |  |  | Three months ended March 31, |
|  |  |  | 2015 |  |  | 2016 |
Forward foreign exchange contracts (Note a) |  | Foreign exchange (gains) losses, net |  | $ | (2,244 | ) |  | $ | (1,134 | )
|  |  |  | $ | (2,244 | ) |  | $ | (1,134 | )
(a) | These forward foreign exchange contracts were entered into to hedge fluctuations in foreign exchange rates for recognized balance sheet items such as receivables and intercompany borrowings, and were not originally designated as hedges under FASB guidance on derivatives and hedging. Realized (gains) losses and changes in the fair value of these derivatives are recorded in foreign exchange (gains) losses, net in the consolidated statements of income.

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- Definition A table or schedule that identifies and provides pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments which includes a combination of the type of instrument, currency being hedged, notional amount, balance sheet exposure asset (liability), or other relevant item. + References No definition available. + Details
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- Definition Tabular disclosure of the effective portion of gains and losses on derivative instruments (and nonderivative instruments) designated and qualifying in cash flow hedges recorded in accumulated other comprehensive income (loss) during the term of the hedging relationship and reclassified into earnings during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
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