ACCOUNTING POLICIES (Details 4) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018		Dec. 31, 2017
Finite-Lived Intangible Assets
Intangible assets subject to amortization	$ 25,181	[1]	$ 17,779
Accumulated amortization of intangible assets subject to amortization	(11,361)		(10,442)
Intangible assets subject to amortization, net	13,820		7,337
Intangible assets not subject to amortization	10,833		0
Intangible assets, net	$ 24,653		$ 7,337
Weighted average
Finite-Lived Intangible Assets
Useful life of intangible assets	6 years 7 months 21 days

[1] At March 31, 2018, the weighted average remaining useful life for intangible assets subject to amortization, excluding fully amortized intangible assets, was 6.64 years.