Investments and Fair Value Measurements Derivative Notional Instruments (Details) - Level 2 - Other current assets - Foreign Exchange Forward € in Thousands, ₪ in Thousands, ¥ in Thousands, ¥ in Thousands, £ in Thousands, R$ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	Mar. 31, 2020 ILS (₪)	Mar. 31, 2020 AUD ($)	Mar. 31, 2020 GBP (£)	Mar. 31, 2020 BRL (R$)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 CAD ($)	Mar. 31, 2020 EUR (€)	Mar. 31, 2020 MXN ($)	Mar. 31, 2020 CNY (¥)	Mar. 31, 2020 JPY (¥)	Dec. 31, 2019 ILS (₪)	Dec. 31, 2019 AUD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2019 BRL (R$)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CAD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 MXN ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 JPY (¥)
Derivative [Line Items]
Notional amount					$ 280,341										$ 333,871
Euro Member Countries, Euro
Derivative [Line Items]
Notional amount					74,274		€ 67,500								108,870		€ 97,000
Chinese Yuan
Derivative [Line Items]
Notional amount					72,825				¥ 517,000						60,702				¥ 431,000
British Pound
Derivative [Line Items]
Notional amount	₪ 26,000				7,349						₪ 63,700				18,439
Brazilian Real
Derivative [Line Items]
Notional amount			£ 23,200		28,894								£ 28,000		36,770
Japanese Yen
Derivative [Line Items]
Notional amount					33,103	$ 47,000									39,802	$ 52,000
Israeli Shekel
Derivative [Line Items]
Notional amount				R$ 150,000	28,765									R$ 130,000	32,185
Japanese Yen
Derivative [Line Items]
Notional amount					24,916					¥ 2,685,000					27,604					¥ 3,000,000
Mexican Peso
Derivative [Line Items]
Notional amount					6,840			$ 160,000							7,398			$ 140,000
Australian Dollar
Derivative [Line Items]
Notional amount		$ 5,500			$ 3,375							$ 3,000			$ 2,101