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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Not Measured on Recurring Basis (Details) - Nonrecurring - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Balance |  |
Financial Assets: |  |
Cash and cash equivalents | $ 398,419 | $ 362,025
Time deposits and restricted cash | 916 | 3,042
Employee loans | 5,669 | 5,978
Balance | Revolving Credit Facility |  |
Financial Liabilities: |  |
Borrowing under 2014 Credit Facility | 25,022 | 25,019
Estimated Fair Value |  |
Financial Assets: |  |
Cash and cash equivalents | 398,419 | 362,025
Time deposits and restricted cash | 916 | 3,042
Employee loans | 5,669 | 5,978
Estimated Fair Value | Revolving Credit Facility |  |
Financial Liabilities: |  |
Borrowing under 2014 Credit Facility | 25,022 | 25,019
Estimated Fair Value | Level 1 |  |
Financial Assets: |  |
Cash and cash equivalents | 398,419 | 362,025
Time deposits and restricted cash | 0 | 0
Employee loans | 0 | 0
Estimated Fair Value | Level 1 | Revolving Credit Facility |  |
Financial Liabilities: |  |
Borrowing under 2014 Credit Facility | 0 | 0
Estimated Fair Value | Level 2 |  |
Financial Assets: |  |
Cash and cash equivalents | 0 | 0
Time deposits and restricted cash | 916 | 3,042
Employee loans | 0 | 0
Financial Liabilities: |  |
Borrowing under 2014 Credit Facility | 25,022 | 25,019
Estimated Fair Value | Level 3 |  |
Financial Assets: |  |
Cash and cash equivalents | 0 | 0
Time deposits and restricted cash | 0 | 0
Employee loans | 5,669 | 5,978
Estimated Fair Value | Level 3 | Revolving Credit Facility |  |
Financial Liabilities: |  |
Borrowing under 2014 Credit Facility | $ 0 | $ 0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: 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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- Definition Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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