AVAILABLE FOR SALE SECURITIES (Details) - USD ($) $ in Thousands, shares in Millions	1 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale Securities [Abstract]
Number of available for sale shares acquired (in shares)		4.1
Purchase of available for sale securities	$ 30,000	$ 48,219	$ 29,966	$ 0
Available for sale securities		45,754	0
Available for sale securities, investment related expenses		3,400	0
Investment income, dividend		$ 2,300	$ 0

The cash outflow to acquire equity securities classified as available-for-sale securities, because they are not classified as trading securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration