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DIVIDENDS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 12, 2018 | Jun. 13, 2018 | Mar. 14, 2018 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Feb. 28, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |
Payment of cash dividends |  |  |  |  |  |  |  | $ 60,395 | $ 57,065
Dividend Declared 2018-Q1 [Member] |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |
Dividend payable, date declared |  |  |  |  |  |  |  | 2018-02 |
Dividend payable per share (in dollars per share) |  |  |  |  |  |  | $ 0.365 |  |
Payment of cash dividends |  |  | $ 19,800 |  |  |  |  |  |
Dividend payable, date to be paid |  |  |  |  |  |  |  | Mar. 14, 2018 |
Dividend payable, date of record |  |  |  |  |  |  |  | Feb. 26, 2018 |
Dividend Declared 2018-Q2 [Member] |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |
Dividend payable, date declared |  |  |  |  |  |  |  | 2018-04 |
Dividend payable per share (in dollars per share) |  |  |  |  |  | $ 0.365 |  |  |
Payment of cash dividends |  | $ 20,300 |  |  |  |  |  |  |
Dividend payable, date to be paid |  |  |  |  |  |  |  | Jun. 13, 2018 |
Dividend payable, date of record |  |  |  |  |  |  |  | May 25, 2018 |
Dividend Declared 2018-Q3 [Member] |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |
Dividend payable, date declared |  |  |  |  |  |  |  | 2018-07 |
Dividend payable per share (in dollars per share) |  |  |  |  | $ 0.365 |  |  |  |
Payment of cash dividends | $ 20,300 |  |  |  |  |  |  |  |
Dividend payable, date to be paid |  |  |  |  |  |  |  | Sep. 12, 2018 |
Dividend payable, date of record |  |  |  |  |  |  |  | Aug. 31, 2018 |
Dividend Declared 2018-Q4 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |
Dividend payable, date declared |  |  |  | 2018-10 |  |  |  |  |
Dividend payable per share (in dollars per share) |  |  |  | $ 0.365 |  |  |  |  |
Dividend payable, date to be paid |  |  |  | Dec. 12, 2018 |  |  |  |  |
Dividend payable, date of record |  |  |  | Nov. 30, 2018 |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 The month and year (YYYY-MM) that the dividend to be paid was declared. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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