Derivative Financial Instruments - Summary of Outstanding Foreign Currency Forward Contracts (Details) - Foreign Currency Forward Contracts - Cash Flow Hedges - Non-designated	9 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($) € / £ € / $ £ / $ $ / ¥ $ / ¥ $ / $	Dec. 31, 2018 USD ($) € / £ € / $ £ / $ $ / ¥ $ / ¥ $ / $
Derivative [Line Items]
Notional Amount	$ 101,942,000	$ 122,353,000
Derivative One
Derivative [Line Items]
Notional Amount	$ 2,242,000	$ 1,221,000
Effective Date	Sep. 30, 2019	Dec. 31, 2018
Maturity Date	Nov. 30, 2019	Feb. 28, 2019
Index	EUR/GBP	EUR/GBP
Weighted Average Foreign Exchange Rate | € / £	0.88592	0.8981
Derivative Two
Derivative [Line Items]
Notional Amount	$ 2,785,000	$ 12,538,000
Effective Date	Sep. 30, 2019	Dec. 31, 2018
Maturity Date	Nov. 30, 2019	Feb. 28, 2019
Index	EUR/USD	EUR/USD
Weighted Average Foreign Exchange Rate | € / $	1.0939	1.1479
Derivative Three
Derivative [Line Items]
Notional Amount	$ 21,195,000	$ 8,463,000
Effective Date	Sep. 30, 2019	Dec. 31, 2018
Maturity Date	Nov. 30, 2019	Feb. 28, 2019
Index	GBP/USD	GBP/USD
Weighted Average Foreign Exchange Rate | £ / $	1.2328	1.2785
Derivative Four
Derivative [Line Items]
Notional Amount	$ 39,681,000	$ 44,946,000
Effective Date	Sep. 30, 2019	Dec. 31, 2018
Maturity Date	Nov. 30, 2019	Feb. 28, 2019
Index	USD/CNY	USD/CNY
Weighted Average Foreign Exchange Rate | $ / ¥	7.0985	6.8738
Derivative Five
Derivative [Line Items]
Notional Amount	$ 806,000	$ 844,000
Effective Date	Sep. 30, 2019	Dec. 31, 2018
Maturity Date	Nov. 30, 2019	Feb. 28, 2019
Index	USD/JPY	USD/JPY
Weighted Average Foreign Exchange Rate | $ / ¥	108.08	110.14
Derivative Six
Derivative [Line Items]
Notional Amount	$ 33,733,000	$ 54,041,000
Effective Date	Sep. 30, 2019	Dec. 31, 2018
Maturity Date	Nov. 30, 2019	Feb. 28, 2019
Index	USD/TWD	USD/TWD
Weighted Average Foreign Exchange Rate | $ / $	30.925	30.559
Derivative Seven
Derivative [Line Items]
Notional Amount	$ 500,000	$ 300,000
Effective Date	Jan. 31, 2019	Dec. 31, 2018
Maturity Date	Oct. 31, 2019	Jan. 31, 2019
Index	USD/TWD	USD/TWD
Weighted Average Foreign Exchange Rate | $ / $	30.635	30.669
Derivative Eight
Derivative [Line Items]
Notional Amount	$ 500,000
Effective Date	Jan. 31, 2019
Maturity Date	Jan. 31, 2020
Index	USD/TWD
Weighted Average Foreign Exchange Rate | $ / $	30.635
Derivative Nine
Derivative [Line Items]
Notional Amount	$ 500,000
Effective Date	Jan. 31, 2019
Maturity Date	Nov. 30, 2019
Index	USD/TWD
Weighted Average Foreign Exchange Rate | $ / $	30.705