Derivative Financial Instruments - Summary of Outstanding Foreign Currency Forward Contracts (Details) - Foreign Currency Forward Contracts - Cash Flow Hedges - Non-designated	6 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($) € / £ € / $ £ / $ $ / ¥ $ / ¥ $ / $	Dec. 31, 2018 USD ($) € / £ € / $ £ / $ $ / ¥ $ / ¥ $ / $
Derivative [Line Items]
Notional Amount	$ 77,535,000	$ 122,353,000
Derivative One
Derivative [Line Items]
Notional Amount	$ 1,983,000	$ 1,221,000
Effective Date	Jun. 30, 2019	Dec. 31, 2018
Maturity Date	Aug. 31, 2019	Feb. 28, 2019
Index	EUR/GBP	EUR/GBP
Weighted Average Foreign Exchange Rate | € / £	0.896	0.8981
Derivative Two
Derivative [Line Items]
Notional Amount	$ 5,072,000	$ 12,538,000
Effective Date	Jun. 30, 2019	Dec. 31, 2018
Maturity Date	Aug. 31, 2019	Feb. 28, 2019
Index	EUR/USD	EUR/USD
Weighted Average Foreign Exchange Rate | € / $	1.1415	1.1479
Derivative Three
Derivative [Line Items]
Notional Amount	$ 7,819,000	$ 8,463,000
Effective Date	Jun. 30, 2019	Dec. 31, 2018
Maturity Date	Aug. 31, 2019	Feb. 28, 2019
Index	GBP/USD	GBP/USD
Weighted Average Foreign Exchange Rate | £ / $	1.2725	1.2785
Derivative Four
Derivative [Line Items]
Notional Amount	$ 38,834,000	$ 44,946,000
Effective Date	Jun. 30, 2019	Dec. 31, 2018
Maturity Date	Aug. 31, 2019	Feb. 28, 2019
Index	USD/CNY	USD/CNY
Weighted Average Foreign Exchange Rate | $ / ¥	6.8648	6.8738
Derivative Five
Derivative [Line Items]
Notional Amount	$ 1,022,000	$ 844,000
Effective Date	Jun. 30, 2019	Dec. 31, 2018
Maturity Date	Aug. 31, 2019	Feb. 28, 2019
Index	USD/JPY	USD/JPY
Weighted Average Foreign Exchange Rate | $ / ¥	107.515	110.14
Derivative Six
Derivative [Line Items]
Notional Amount	$ 21,305,000	$ 54,041,000
Effective Date	Jun. 30, 2019	Dec. 31, 2018
Maturity Date	Aug. 31, 2019	Feb. 28, 2019
Index	USD/TWD	USD/TWD
Weighted Average Foreign Exchange Rate | $ / $	30.899	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