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AVAILABLE-FOR-SALE SECURITIES AND FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2017
AVAILABLE-FOR-SALE SECURITIES AND FAIR VALUE MEASUREMENTS |
Schedule of amortized cost and estimated fair values for available-for-sale securities |
|  | December 31, 2017 |
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |
U.S. government securities |  | $ | 9,943 |  | $ | — |  | $ | (1 | ) | $ | 9,942 |
U.S. government agencies |  |  | 9,987 |  |  | — |  |  | (2 | ) |  | 9,985 |
U.S. corporate notes |  |  | 10,881 |  |  | — |  |  | (15 | ) |  | 10,866 |
U.S. commercial papers |  |  | 29,945 |  |  | — |  |  | — |  |  | 29,945 |
Money market funds |  |  | 61,971 |  |  | — |  |  | — |  |  | 61,971 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  | $ | 122,727 |  | $ | — |  | $ | (18 | ) | $ | 122,709 |
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|  | December 31, 2016 |
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |
U.S. government agencies |  | $ | 12,428 |  | $ | 1 |  | $ | — |  | $ | 12,429 |
U.S. commercial papers |  |  | 72,065 |  |  | — |  |  | — |  |  | 72,065 |
Money market funds |  |  | 64,319 |  |  | — |  |  | — |  |  | 64,319 |
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Total |  | $ | 148,812 |  | $ | 1 |  | $ | — |  | $ | 148,813 |
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Schedule of available-for-sale securities measured on a recurring basis |
|  | Estimated Fair Value Measurements as of December 31, 2017 Using: |
|  | Quoted Price in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  |  |
Types of Instruments (In thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | $ | — |  | $ | 9,942 |  | $ | — |  | $ | 9,942 |
U.S. government agencies |  |  | — |  |  | 9,985 |  |  | — |  |  | 9,985 |
U.S. corporate notes |  |  | — |  |  | 10,866 |  |  | — |  |  | 10,866 |
U.S. commercial papers |  |  | — |  |  | 29,945 |  |  | — |  |  | 29,945 |
Money market funds |  |  | 61,971 |  |  | — |  |  | — |  |  | 61,971 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total assets measured at estimated fair value |  | $ | 61,971 |  | $ | 60,738 |  | $ | — |  | $ | 122,709 |
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Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Term B Loan |  | $ | — |  | $ | 243,750 |  | $ | — |  | $ | 243,750 |
2023 Notes |  |  | — |  |  | 241,259 |  |  | — |  |  | 241,259 |
2025 Notes |  |  | — |  |  | 205,975 |  |  | — |  |  | 205,975 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total fair value of liabilities |  | $ | — |  | $ | 690,984 |  | $ | — |  | $ | 690,984 |
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|  | Estimated Fair Value Measurements as of December 31, 2016 Using: |
|  | Quoted Price in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  |  |
Types of Instruments (In thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies |  | $ | — |  | $ | 12,429 |  | $ | — |  | $ | 12,429 |
U.S. commercial papers |  |  | — |  |  | 72,065 |  |  | — |  |  | 72,065 |
Money market funds |  |  | 64,319 |  |  | — |  |  | — |  |  | 64,319 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total assets measured at estimated fair value |  | $ | 64,319 |  | $ | 84,494 |  | $ | — |  | $ | 148,813 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
2023 Notes |  | $ | — |  | $ | 202,125 |  | $ | — |  | $ | 202,125 |
2029 Notes |  |  | — |  |  | 487,189 |  |  | — |  |  | 487,189 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total fair value of liabilities |  | $ | — |  | $ | 689,314 |  | $ | — |  | $ | 689,314 |
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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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