Summary of Significant Accounting Policies (Details 9) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014 item	Dec. 31, 2013	Dec. 31, 2012
Assets and liabilities carried at fair value measured on a recurring basis
Trading securities	$ 13,172us-gaap_TradingSecurities	$ 13,386us-gaap_TradingSecurities
Available-for-sale and Trading Securities
Number of trust that holds marketable securities	1
Net realized and unrealized gain (loss) on trading securities	1,112	2,283	1,292
Foreign Currency Cash Flow Hedges
Maximum Length of Time Hedged in Foreign Currency Cash Flow Hedge	6 months
Fair value measured on recurring basis \| Total Carrying Value
Assets and liabilities carried at fair value measured on a recurring basis
Money market funds	36,828	33,860
Time deposits	16,204	2,753
Trading securities	13,172	13,386
Derivative assets		72
Derivative liabilities	2,411	5,592
Fair value measured on recurring basis \| Quoted prices in active markets (Level 1)
Assets and liabilities carried at fair value measured on a recurring basis
Trading securities	12,428	12,785
Fair value measured on recurring basis \| Significant other observable inputs (Level 2)
Assets and liabilities carried at fair value measured on a recurring basis
Money market funds	36,828	33,860
Time deposits	16,204	2,753
Trading securities	744	601
Derivative assets		72
Derivative liabilities	$ 2,411	$ 5,592

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Represents the number of trust that holds marketable securities.

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

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Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (d)

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

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The sum of the realized and unrealized net gain (loss) on trading securities during the period.

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-Publisher FASB

-Name Accounting Standards Codification

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Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

-Topic 942

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-Section S99

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