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L. SHARE-BASED COMPENSATION - OPTION ACTIVITY (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Number of Shares |  |  |
Outstanding, beginning balance | 1,310 | 1,423 | 1,468
Granted |  |  | 108
Exercised | (159) | (81) | (104)
Forfeited | (21) | (32) | (48)
Expired |  |  | (1)
Outstanding, ending balance | 1,130 | 1,310 | 1,423
Exericsable, ending balance | 877 |  |
Vested and expected to vest | 1,122 |  |
Weighted Average Exercise Price |  |  |
Outstanding, beginning balance | $ 9.07 | $ 8.96 | $ 8.38
Granted |  |  | 13.84
Exercised | 6.91 | 7.09 | 6.22
Forfeited | 7.96 | 8.96 | 8.23
Expired |  |  | 6.21
Outstanding, ending balance | 9.40 | 9.07 | 8.96
Exericsable, ending balance | 9.18 |  |
Vested and expected to vest | 9.39 |  |
Weighted Average Share Price on Date of Exercise | 19.90 | 16.53 |
Weighted Average Fair Value [Abstract] |  |  |
Outstanding, beginning balance | 4.59 | 4.48 | 4.17
Granted |  |  | 7.24
Exercised | 2.56 | 2.62 | 2.57
Forfeited | 3.29 | 4.43 | 5.43
Expired |  |  | 2.21
Outstanding, ending balance | 4.90 | $ 4.59 | $ 4.48
Exericsable, ending balance | 4.78 |  |
Vested and expected to vest | $ 4.90 |  |
Weighted Average Remaining Contractual Life |  |  |
Outstanding, ending balance | 6 years 4 months 29 days |  |
Exercisable, ending balance | 6 years 4 months |  |
Vested and expected to vest | 6 years 4 months 28 days |  |
Aggregate Intrinsic Value |  |  |
Aggregate intrinsic value, beginning balance | $ 10,598 | $ 3,486 | $ 9,731
Exercised | 2,071 | 762 | 1,476
Forfeited | 273 | 212 | 628
Expired |  |  | 11
Aggregate intrinsic value, ending balance | 15,872 | $ 10,598 | $ 3,486
Exercisable, ending balance | 12,499 |  |
Vested and expected to vest | $ 15,767 |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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