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STOCK-BASED COMPENSATION - Valuation Assumptions (Details) - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Valuation Assumptions |  |  |
Dividend yield (as a percent) | 0.00% |  |
Maximum |  |  |
Valuation Assumptions |  |  |
Dividend yield (as a percent) |  | 0.00% |
Stock options |  |  |
Valuation Assumptions |  |  |
Options granted (in shares) | 0 | 0 | 0
ESPP | Employee Stock |  |  |
Valuation Assumptions |  |  |
Dividend yield (as a percent) | 0.00% | 0.00% |
Weighted-average estimated fair value of shares granted (in dollars per share) | $ 3.90 | $ 4.47 | $ 4.52
ESPP | Employee Stock | Minimum |  |  |
Valuation Assumptions |  |  |
Risk-free interest rate (as a percent) | 1.40% | 0.40% | 0.10%
Expected term (in years) | 6 months | 6 months | 6 months
Volatility (as a percent) | 35.00% | 39.00% | 44.00%
Dividend yield (as a percent) |  |  | 0.00%
ESPP | Employee Stock | Maximum |  |  |
Valuation Assumptions |  |  |
Risk-free interest rate (as a percent) | 1.70% | 1.00% | 0.90%
Expected term (in years) | 2 years | 2 years | 2 years
Volatility (as a percent) | 44.00% | 66.00% | 69.00%
Dividend yield (as a percent) |  |  | 6.00%

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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