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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$)
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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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