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Derivatives - Schedule of Unsettled Purchased Foreign Currency Forward Contracts (Details) - Foreign currency forward contracts [Member] € in Thousands, ₨ in Thousands, £ in Thousands, SGD in Thousands, PLN in Thousands, AUD in Thousands, $ in Thousands | Sep. 30, 2016 GBP (£) | Sep. 30, 2016 AUD | Sep. 30, 2016 INR (₨) | Sep. 30, 2016 PLN | Sep. 30, 2016 USD ($) | Sep. 30, 2016 EUR (€) | Sep. 30, 2016 SGD | Dec. 31, 2015 GBP (£) | Dec. 31, 2015 AUD | Dec. 31, 2015 INR (₨) | Dec. 31, 2015 PLN | Dec. 31, 2015 USD ($) | Dec. 31, 2015 EUR (€)
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Australian Dollar [Member] | Short [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  |  |  |  | AUD 2,080 |  |  | $ 1,570 |
Average contract rate |  |  |  |  |  |  |  | 0.7548 | 0.7548 | 0.7548 | 0.7548 | 0.7548 | 0.7548
Australian Dollar [Member] | Long [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  | AUD 19,700 |  |  | $ 14,454 |  |  |  | AUD 1,260 |  |  | $ 939 |
Average contract rate | 0.7337 | 0.7337 | 0.7337 | 0.7337 | 0.7337 | 0.7337 | 0.7337 | 0.7452 | 0.7452 | 0.7452 | 0.7452 | 0.7452 | 0.7452
Euro [Member] | Short [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  |  |  |  |  |  |  | $ 3,169 | € 2,870
Average contract rate |  |  |  |  |  |  |  | 1.1042 | 1.1042 | 1.1042 | 1.1042 | 1.1042 | 1.1042
Euro [Member] | Long [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  | $ 2,031 | € 1,800 |  |  |  |  |  | $ 3,122 | € 2,870
Average contract rate | 1.1283 | 1.1283 | 1.1283 | 1.1283 | 1.1283 | 1.1283 | 1.1283 | 1.0878 | 1.0878 | 1.0878 | 1.0878 | 1.0878 | 1.0878
British Pound Sterling [Member] | Long [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative notional amount | £ 18,100 |  |  |  | $ 25,143 |  |  | £ 18,075 |  |  |  | $ 27,415 |
Average contract rate | 1.3891 | 1.3891 | 1.3891 | 1.3891 | 1.3891 | 1.3891 | 1.3891 | 1.5167 | 1.5167 | 1.5167 | 1.5167 | 1.5167 | 1.5167
Indian Rupee [Member] | Long [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  | ₨ 1,195,500 |  | $ 17,136 |  |  |  |  | ₨ 1,880,500 |  | $ 27,736 |
Average contract rate | 0.0143 | 0.0143 | 0.0143 | 0.0143 | 0.0143 | 0.0143 | 0.0143 | 0.0147 | 0.0147 | 0.0147 | 0.0147 | 0.0147 | 0.0147
Polish Zloty [Member] | Long [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  | PLN 263,250 | $ 67,470 |  |  |  |  |  | PLN 226,500 | $ 59,120 |
Average contract rate | 0.2563 | 0.2563 | 0.2563 | 0.2563 | 0.2563 | 0.2563 | 0.2563 | 0.2610 | 0.2610 | 0.2610 | 0.2610 | 0.2610 | 0.2610
Singapore Dollar [Member] | Long [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  | $ 32,525 |  | SGD 44,600 |  |  |  |  |  |
Average contract rate | 0.7293 | 0.7293 | 0.7293 | 0.7293 | 0.7293 | 0.7293 | 0.7293 |  |  |  |  |  |

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