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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Liabilities: |  |
Short-term debt | $ 138,000 | $ 180,000
Fair Value, Inputs, Level 1 [Member] |  |
Cash and cash equivalents: |  |
Time deposits with original maturities less than three months | 13,055 | 5,918
Marketable securities available-for-sale: |  |
Time deposit with original maturities more than three months | 0 | 0
Money market fund | 5,017 | 13,083
Restricted marketable securities: |  |
Time deposits with original maturities of more than three months | 0 | 0
Total assets | 18,072 | 19,001
Liabilities: |  |
Short-term debt | 0 | 0
Total liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Cash and cash equivalents: |  |
Time deposits with original maturities less than three months | 0 | 0
Marketable securities available-for-sale: |  |
Time deposit with original maturities more than three months | 5,140 | 5,428
Money market fund | 0 | 0
Restricted marketable securities: |  |
Time deposits with original maturities of more than three months | 324 | 563
Total assets | 5,464 | 5,991
Liabilities: |  |
Short-term debt | 138,000 | 180,000
Total liabilities | 138,000 | 180,000
Fair Value, Inputs, Level 3 [Member] |  |
Cash and cash equivalents: |  |
Time deposits with original maturities less than three months | 0 | 0
Marketable securities available-for-sale: |  |
Time deposit with original maturities more than three months | 0 | 0
Money market fund | 0 | 0
Restricted marketable securities: |  |
Time deposits with original maturities of more than three months | 0 | 0
Total assets | 0 | 0
Liabilities: |  |
Short-term debt | 0 | 0
Total liabilities | $ 0 | $ 0

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- Definition Amount of time deposits with original maturities in less than three months. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts. + References No definition available. + Details
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- Definition Amount of time deposits with original maturities more than three months. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts. + References No definition available. + Details
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- Definition Amount of time deposits with original maturities more than three months. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition 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. + References 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 + Details
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