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DIVIDENDS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended			6 Months Ended
	Jun. 13, 2018	Mar. 14, 2018	Jul. 31, 2018	Apr. 30, 2018	Feb. 28, 2018	Jun. 30, 2018	Jun. 30, 2017
Dividends per Share [Abstract]
Payment of cash dividends						$ 40,091	$ 38,042
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] | Subsequent Event [Member]
Dividends per Share [Abstract]
Dividend payable, date declared			2018-07
Dividend payable per share (in dollars per share)			$ 0.365
Dividend payable, date to be paid			Sep. 12, 2018
Dividend payable, date of record			Aug. 31, 2018

X

- 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

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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
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The month and year (YYYY-MM) that the dividend to be paid was declared.

+ References

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-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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