Current Vulnerability Due to Certain Concentrations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Concentration Risks [Abstract]
Duration of business operations in Israel (in years)	P44Y
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Bank Hapoalim
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	12.40%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Bank Leumi [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	10.30%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | HSBC [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	12.30%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Deutsche Bank [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	12.60%
Geographic Concentration [Member] | Outside Of United States [Member]
Concentration Risks [Abstract]
Cash and cash equivalents and short-term investments	1,100,025
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | United States [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	1.10%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Germany [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	41.00%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Other Europe [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	1.40%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Israel [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	26.60%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | People's Republic Of China [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	8.60%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Other Asia [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	1.60%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Other [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	0.90%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Singapore [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	7.30%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | The Republic of China (Taiwan)
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	9.70%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Canada [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	1.80%
Geographic Concentration [Member] | Revenue [Member] | Outside Of United States [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	76.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	14.70%	13.90%