SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Disclosure Of Accounting Policies [Line Items]
Restricted cash held by trustees	$ 1,204	$ 15,441
Trust liabilities	$ 2,614	$ 12,858

Other short-term assets not otherwise listed in the existing taxonomy that are pledged or subject to withdrawal restrictions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_OtherRestrictedAssetsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant