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AVAILABLE-FOR-SALE SECURITIES AND FAIR VALUE MEASUREMENTS - Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Recurring basis |  |
Assets |  |
Total assets measured at estimated fair value | $ 122,709 | $ 148,813
Recurring basis | U.S. government securities |  |
Assets |  |
Total assets measured at estimated fair value | 9,942 |
Recurring basis | U.S. government agencies |  |
Assets |  |
Total assets measured at estimated fair value | 9,985 | 12,429
Recurring basis | U.S. corporate notes |  |
Assets |  |
Total assets measured at estimated fair value | 10,866 |
Recurring basis | U.S. commercial papers |  |
Assets |  |
Total assets measured at estimated fair value | 29,945 | 72,065
Recurring basis | Money market funds |  |
Assets |  |
Total assets measured at estimated fair value | 61,971 | 64,319
Recurring basis | Quoted Prices in Active Markets for Identical Assets, Level 1 |  |
Assets |  |
Total assets measured at estimated fair value | 61,971 | 64,319
Recurring basis | Quoted Prices in Active Markets for Identical Assets, Level 1 | U.S. government securities |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Recurring basis | Quoted Prices in Active Markets for Identical Assets, Level 1 | U.S. government agencies |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets, Level 1 | U.S. corporate notes |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Recurring basis | Quoted Prices in Active Markets for Identical Assets, Level 1 | U.S. commercial papers |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets, Level 1 | Money market funds |  |
Assets |  |
Total assets measured at estimated fair value | 61,971 | 64,319
Recurring basis | Significant Other Observable Inputs, Level 2 |  |
Assets |  |
Total assets measured at estimated fair value | 60,738 | 84,494
Recurring basis | Significant Other Observable Inputs, Level 2 | U.S. government securities |  |
Assets |  |
Total assets measured at estimated fair value | 9,942 |
Recurring basis | Significant Other Observable Inputs, Level 2 | U.S. government agencies |  |
Assets |  |
Total assets measured at estimated fair value | 9,985 | 12,429
Recurring basis | Significant Other Observable Inputs, Level 2 | U.S. corporate notes |  |
Assets |  |
Total assets measured at estimated fair value | 10,866 |
Recurring basis | Significant Other Observable Inputs, Level 2 | U.S. commercial papers |  |
Assets |  |
Total assets measured at estimated fair value | 29,945 | 72,065
Recurring basis | Significant Other Observable Inputs, Level 2 | Money market funds |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs, Level 3 |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs, Level 3 | U.S. government securities |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Recurring basis | Significant Unobservable Inputs, Level 3 | U.S. government agencies |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs, Level 3 | U.S. corporate notes |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Recurring basis | Significant Unobservable Inputs, Level 3 | U.S. commercial papers |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs, Level 3 | Money market funds |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Nonrecurring basis | Debt Securities |  |
Liabilities |  |
Term B Loan | 243,750 |
2023 Notes | 241,259 | 202,125
2025 Notes | 205,975 |
2029 Notes |  | 487,189
Total fair value of liabilities | 690,984 | 689,314
Nonrecurring basis | Quoted Prices in Active Markets for Identical Assets, Level 1 | Debt Securities |  |
Liabilities |  |
Term B Loan | 0 |
2023 Notes | 0 | 0
2025 Notes | 0 |
2029 Notes |  | 0
Total fair value of liabilities | 0 | 0
Nonrecurring basis | Significant Other Observable Inputs, Level 2 | Debt Securities |  |
Liabilities |  |
Term B Loan | 243,750 |
2023 Notes | 241,259 | 202,125
2025 Notes | 205,975 |
2029 Notes |  | 487,189
Total fair value of liabilities | 690,984 | 689,314
Nonrecurring basis | Significant Unobservable Inputs, Level 3 | Debt Securities |  |
Liabilities |  |
Term B Loan | 0 |
2023 Notes | 0 | 0
2025 Notes | 0 |
2029 Notes |  | 0
Total fair value of liabilities | $ 0 | $ 0

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- Definition Fair value portion of long-term notes which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. Senior debt has the highest claim on the assets of the issuer in case of bankruptcy or liquidation, due within one year or the normal operating cycle, if longer. Senior note holders are paid off in full before any payments are made to debt holders having a lesser priority of repayment. + References No definition available. + Details
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