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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record Date | Dec. 07, 2015 | Sep. 14, 2015 | Jun. 15, 2015 | Mar. 20, 2015 | Dec. 08, 2014 | Sep. 15, 2014 | Jun. 16, 2014 | Mar. 17, 2014 | Dec. 09, 2013 | Sep. 16, 2013 | Jun. 17, 2013 | Mar. 18, 2013 |  |  |
Payment Date | Dec. 11, 2015 | Sep. 21, 2015 | Jun. 19, 2015 | Mar. 23, 2015 | Dec. 15, 2014 | Sep. 22, 2014 | Jun. 23, 2014 | Mar. 24, 2014 | Dec. 16, 2013 | Sep. 23, 2013 | Jun. 24, 2013 | Mar. 25, 2013 |  |  |
Dividend (per share) | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.14 | $ 0.14 | $ 0.14 | $ 0.14 | $ 0.64 | $ 0.60 | $ 0.56
Dividend paid, amount | $ 1,815 | $ 1,815 | $ 1,814 | $ 1,809 | $ 1,695 | $ 1,696 | $ 1,695 | $ 1,692 | $ 1,577 | $ 1,575 | $ 1,573 | $ 1,569 | $ 7,253 | $ 6,778 | $ 6,294

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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=6367179&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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