Current Vulnerability Due to Certain Concentrations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Concentration Risks [Abstract]
Duration of business operations in Israel (in years)	42
Peoples Republic Of China [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	7.80%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Bank Hapoalim
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	12.60%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Bank Leumi [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	13.30%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Unicredit [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	20.80%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | KBC [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	12.60%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | HSBC [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	15.90%
Geographic Concentration [Member] | United States [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	1.80%
Geographic Concentration [Member] | Germany [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	37.90%
Geographic Concentration [Member] | Other Europe [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	7.10%
Geographic Concentration [Member] | Israel [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	26.00%
Geographic Concentration [Member] | Other Asia [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	9.30%
Geographic Concentration [Member] | Other Geographic Area [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	0.60%
Geographic Concentration [Member] | Singapore [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	9.50%
Geographic Concentration [Member] | Outside Of United States [Member]
Concentration Risks [Abstract]
Cash and cash equivalents and short-term investments	974,323
Geographic Concentration [Member] | Revenue [Member] | Outside Of United States [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	74.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	14.70%	10.90%