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, SFr in Thousands, R$ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	Sep. 30, 2020 CNY (¥)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 EUR (€)	Sep. 30, 2020 CAD ($)	Sep. 30, 2020 GBP (£)	Sep. 30, 2020 JPY (¥)	Sep. 30, 2020 BRL (R$)	Sep. 30, 2020 ILS (₪)	Sep. 30, 2020 MXN ($)	Sep. 30, 2020 AUD ($)	Sep. 30, 2020 CHF (SFr)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 CAD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2019 JPY (¥)	Dec. 31, 2019 BRL (R$)	Dec. 31, 2019 ILS (₪)	Dec. 31, 2019 MXN ($)	Dec. 31, 2019 AUD ($)
Derivative [Line Items]
Notional amount		$ 485,060											$ 333,871
Euro Member Countries, Euro
Derivative [Line Items]
Notional amount		148,852	€ 127,000										108,870	€ 97,000
Euro
Derivative [Line Items]
Notional amount	¥ 1,075,000	158,198										¥ 431,000	60,702
British Pound
Derivative [Line Items]
Notional amount		15,441						₪ 53,000					18,439						₪ 63,700
Japanese Yen
Derivative [Line Items]
Notional amount		37,524			£ 29,200								36,770			£ 28,000
Brazilian Real
Derivative [Line Items]
Notional amount		57,570		$ 77,000									39,802		$ 52,000
Israeli Shekel
Derivative [Line Items]
Notional amount		19,899					R$ 112,500						32,185					R$ 130,000
Brazilian Real
Derivative [Line Items]
Notional amount		32,042				¥ 3,385,000							27,604				¥ 3,000,000
Mexican Peso
Derivative [Line Items]
Notional amount		6,266							$ 140,000				7,398							$ 140,000
Swiss Franc
Derivative [Line Items]
Notional amount		4,925								$ 6,900			$ 2,101								$ 3,000
Switzerland, Francs
Derivative [Line Items]
Notional amount		$ 4,343									SFr 4,000