Derivatives - Forward Notional Contracts (Details) - Jun. 30, 2019 - Foreign currency forward contracts € in Thousands, ₩ in Thousands, ¥ in Thousands, ¥ in Thousands, £ in Thousands, kr in Thousands, kr in Thousands, kr in Thousands, SFr in Thousands, R$ in Thousands, R in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	CNY (¥)	CHF (SFr)	NOK (kr)	DKK (kr)	MXN ($)	HKD ($)	KRW (₩)	CAD ($)	ZAR (R)	GBP (£)	JPY (¥)	SGD ($)	SEK (kr)	EUR (€)	BRL (R$)	AUD ($)
Designated as hedging instrument | Derivatives designated as cash flow hedges
Derivative [Line Items]
Notional amount of derivative	¥ 166,500	SFr 1,970	kr 6,000	kr 18,175	$ 296,500		₩ 4,475,000	$ 4,330		£ 4,820	¥ 1,335,000		kr 29,210	€ 22,600	R$ 1,080	$ 3,430
Not designated as hedging instrument
Derivative [Line Items]
Notional amount of derivative	¥ 85,226	SFr 643	kr 3,180	kr 2,544	$ 25,000	$ 11,000	₩ 6,000,000	$ 2,652	R 37,800	£ 5,653	¥ 1,445,574	$ 1,676	kr 17,154	€ 11,717	R$ 9,000	$ 13,788