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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 (€)
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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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Average contractual rate at which a foreign currency can be purchased or sold.

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- Definition

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