Current Vulnerability Due to Certain Concentrations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Concentration Risks [Abstract]
Duration of business operations in Israel (in years)	P43Y
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Bank Leumi [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	10.10%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Unicredit [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	14.30%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | KBC [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	10.60%
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] | Bank of Tokyo Mitsubishi [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	13.20%
Geographic Concentration [Member] | Outside Of United States [Member]
Concentration Risks [Abstract]
Cash and cash equivalents and short-term investments	$ 1,132,079
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | United States [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	1.70%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Germany [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	44.40%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Other Europe [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	1.60%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Israel [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	22.50%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Peoples Republic Of China [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	7.60%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Other Asia [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	3.20%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Other [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	0.80%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Singapore [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	8.60%
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)	6.40%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Canada [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	3.20%
Geographic Concentration [Member] | Revenue [Member] | Outside Of United States [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	75.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	13.90%	14.70%