Derivatives - Forward Notional Contracts (Details) - 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, $ in Thousands	Dec. 31, 2019 JPY (¥) DerivativeInstrument	Dec. 31, 2019 DKK (kr) DerivativeInstrument	Dec. 31, 2019 HKD ($) DerivativeInstrument	Dec. 31, 2019 ZAR (R) DerivativeInstrument	Dec. 31, 2019 EUR (€) DerivativeInstrument	Dec. 31, 2019 NZD ($) DerivativeInstrument	Dec. 31, 2019 SEK (kr) DerivativeInstrument	Dec. 31, 2019 AUD ($) DerivativeInstrument	Dec. 31, 2019 BRL (R$) DerivativeInstrument	Dec. 31, 2019 MXN ($) DerivativeInstrument	Dec. 31, 2019 CHF (SFr) DerivativeInstrument	Dec. 31, 2019 NOK (kr) DerivativeInstrument	Dec. 31, 2019 GBP (£) DerivativeInstrument	Dec. 31, 2019 SGD ($) DerivativeInstrument	Dec. 31, 2019 CAD ($) DerivativeInstrument	Dec. 31, 2019 KRW (₩) DerivativeInstrument	Dec. 31, 2019 CNY (¥) DerivativeInstrument
Designated as hedging instrument | Derivatives designated as cash flow hedges
Derivative [Line Items]
Average number of contracts entered into per month	150	150	150	150	150	150	150	150	150	150	150	150	150	150	150	150	150
Notional amount of derivative	¥ 1,145,000	kr 33,575			€ 37,750		kr 54,170	$ 8,540	R$ 10,315	$ 527,000	SFr 3,660	kr 15,475	£ 8,380		$ 8,025	₩ 8,950,000	¥ 591,000
Not designated as hedging instrument
Derivative [Line Items]
Average number of contracts entered into per month	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20
Notional amount of derivative	¥ 1,530,000	kr 5,987	$ 11,000	R 50,843	€ 752	$ 1,542	kr 13,577	$ 14,282	R$ 19,500	$ 35,000	SFr 306	kr 3,767	£ 7,594	$ 1,790	$ 1,706	₩ 4,868,000	¥ 52,598