SIGNIFICANT ACCOUNTING POLICIES (Goodwill and Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment charge	$ 123,414	$ 0	$ 0
Minimum | Permits
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	5 years
Minimum | Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	3 years
Maximum | Permits
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	30 years
Maximum | Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	20 years