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SHAREHOLDERS EQUITY - Summary of Dividend payments (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record Date | Dec. 04, 2017 | Sep. 11, 2017 | Jun. 13, 2017 | Mar. 27, 2017 | Dec. 05, 2016 | Sep. 12, 2016 | Jun. 13, 2016 | Mar. 21, 2016 | Dec. 07, 2015 | Sep. 14, 2015 | Jun. 15, 2015 | Mar. 20, 2015 |  |  |
Payment Date | Dec. 11, 2017 | Sep. 18, 2017 | Jun. 20, 2017 | Apr. 03, 2017 | Dec. 12, 2016 | Sep. 19, 2016 | Jun. 20, 2016 | Mar. 28, 2016 | Dec. 11, 2015 | Sep. 21, 2015 | Jun. 19, 2015 | Mar. 23, 2015 |  |  |
Dividend (per share) | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.17 | $ 0.17 | $ 0.17 | $ 0.17 | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.72 | $ 0.68 | $ 0.64
Dividend paid, amount | $ 2,049 | $ 2,048 | $ 2,048 | $ 2,043 | $ 1,929 | $ 1,928 | $ 1,929 | $ 1,929 | $ 1,815 | $ 1,815 | $ 1,814 | $ 1,809 | $ 8,188 | $ 7,715 | $ 7,253

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + 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 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + 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 + Details
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