Derivatives - Forward Notional Contracts (Details) - Mar. 31, 2019 - Foreign currency forward contracts € in Thousands, ₩ in Thousands, ¥ in Thousands, ¥ in Thousands, £ in Thousands, kr in Thousands, kr in Thousands, SFr in Thousands, R$ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	DKK (kr)	MXN ($)	CNY (¥)	KRW (₩)	GBP (£)	CAD ($)	JPY (¥)	SGD ($)	SEK (kr)	CHF (SFr)	HKD ($)	BRL (R$)	EUR (€)	AUD ($)
Designated as hedging instrument | Derivatives designated as cash flow hedges
Derivative [Line Items]
Notional amount of derivative	kr 15,725	$ 215,500	¥ 238,000	₩ 3,750,000	£ 4,915	$ 3,850	¥ 1,305,000		kr 25,180	SFr 2,125			€ 18,065	$ 3,100
Not designated as hedging instrument
Derivative [Line Items]
Notional amount of derivative	kr 4,550	$ 18,000	¥ 50,920	₩ 5,500,000	£ 3,350	$ 1,136	¥ 265,000	$ 8,500	kr 12,000	SFr 500	$ 11,000	R$ 9,000	€ 7,293	$ 11,400