Derivative Instruments - Outstanding Forward Contracts (Details) - Not Designated as Hedging Instrument [Member] ₩ in Thousands, ¥ in Thousands, £ in Thousands, Ft in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2018 HUF (Ft)	Dec. 31, 2018 GBP (£)	Dec. 31, 2018 SGD ($)	Dec. 31, 2018 JPY (¥)	Dec. 31, 2018 KRW (₩)	Dec. 31, 2018 TWD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 HUF (Ft)	Dec. 31, 2017 GBP (£)	Dec. 31, 2017 SGD ($)	Dec. 31, 2017 JPY (¥)	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 TWD ($)
Euro [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	$ 26,330				¥ 23,000			$ 0				¥ 0
Japanese Yen [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	3,459				¥ 380,000			4,049				¥ 455,000
British Pound [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	3,204		£ 2,500					2,232		£ 1,650
Korean Won [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	2,808					₩ 3,125,000		1,708					₩ 1,825,000
Hungarian Forint [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	2,685	Ft 750,000						2,110	Ft 545,000
Taiwanese Dollar [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	1,807						$ 55,000	1,278						$ 37,725
Canadian Dollar [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	726						990	0						0
Singapore Dollar [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	514			$ 700				0			$ 0
Swiss Franc [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	$ 0						$ 0	$ 1,401						$ 1,365