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COMMON STOCK REPURCHASE AND ISSUANCE - Repurchase Program November 2014 (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 12, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity, Class of Treasury stock |  |  |  |
Value of shares repurchased |  | $ 140 | $ 4,096 | $ 3,695
Repurchase program November 2014 |  |  |  |
Equity, Class of Treasury stock |  |  |  |
Share repurchase program, Authorized amount | $ 40,000 |  |  |
Share repurchase program, Period in force | 24 months |  |  |
Shares repurchased under program |  | 72,739 | 2,054,655 | 1,563,302
Value of shares repurchased |  | $ 100 | $ 4,100 | $ 3,700

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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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