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Derivatives - Schedule of Unsettled Purchased Foreign Currency Forward Contracts (Details) - Long - Foreign currency forward contracts ₨ in Thousands, £ in Thousands, zł in Thousands, kr in Thousands, R$ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands | Sep. 30, 2019 PLN (zł) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 INR (₨) | Sep. 30, 2019 SEK (kr) | Sep. 30, 2019 AUD ($) | Sep. 30, 2019 GBP (£) | Sep. 30, 2019 SGD ($) | Dec. 31, 2018 PLN (zł) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 INR (₨) | Dec. 31, 2018 SEK (kr) | Dec. 31, 2018 AUD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 SGD ($) | Dec. 31, 2018 BRL (R$)
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Polish Zloty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount | zł 243,500 | $ 63,679 |  |  |  |  |  | zł 232,500 | $ 64,281 |  |  |  |  |  |
Average Contract Rate | 0.2615 | 0.2615 | 0.2615 | 0.2615 | 0.2615 | 0.2615 | 0.2615 | 0.2765 | 0.2765 | 0.2765 | 0.2765 | 0.2765 | 0.2765 | 0.2765 | 0.2765
Indian Rupee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  | $ 44,106 | ₨ 3,195,000 |  |  |  |  |  | $ 39,956 | ₨ 2,880,000 |  |  |  |  |
Average Contract Rate | 0.0139 | 0.0139 | 0.0139 | 0.0139 | 0.0139 | 0.0139 | 0.0139 | 0.0139 | 0.0139 | 0.0139 | 0.0139 | 0.0139 | 0.0139 | 0.0139 | 0.0139
Singapore Dollar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  | $ 41,405 |  |  |  |  | $ 56,400 |  | $ 44,504 |  |  |  |  | $ 59,800 |
Average Contract Rate | 0.7341 | 0.7341 | 0.7341 | 0.7341 | 0.7341 | 0.7341 | 0.7341 | 0.7442 | 0.7442 | 0.7442 | 0.7442 | 0.7442 | 0.7442 | 0.7442 | 0.7442
British Pound Sterling |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  | $ 17,064 |  |  |  | £ 13,100 |  |  | $ 26,525 |  |  |  | £ 19,600 |  |
Average Contract Rate | 1.3026 | 1.3026 | 1.3026 | 1.3026 | 1.3026 | 1.3026 | 1.3026 | 1.3533 | 1.3533 | 1.3533 | 1.3533 | 1.3533 | 1.3533 | 1.3533 | 1.3533
Australian Dollar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  | $ 13,312 |  |  | $ 19,000 |  |  |  | $ 17,674 |  |  | $ 23,950 |  |  |
Average Contract Rate | 0.7006 | 0.7006 | 0.7006 | 0.7006 | 0.7006 | 0.7006 | 0.7006 | 0.7379 | 0.7379 | 0.7379 | 0.7379 | 0.7379 | 0.7379 | 0.7379 | 0.7379
Swedish Krona |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  | $ 5,031 |  | kr 46,100 |  |  |  |  | $ 5,678 |  | kr 48,250 |  |  |  |
Average Contract Rate | 0.1081 | 0.1081 | 0.1081 | 0.1081 | 0.1081 | 0.1081 | 0.1081 | 0.1177 | 0.1177 | 0.1177 | 0.1177 | 0.1177 | 0.1177 | 0.1177 | 0.1177
Brazilian Real |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  |  |  | $ 3,753 |  |  |  |  |  | R$ 14,300
Average Contract Rate |  |  |  |  |  |  |  | 0.2615 | 0.2615 | 0.2615 | 0.2615 | 0.2615 | 0.2615 | 0.2615 | 0.2615

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