INVESTMENTS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Investments rollforward
Opening balance			$ 7,971	$ 8,543	$ 8,543
Additions during the year			1,211
Disposals during the period			(4,370)		(2,163)
Other Comprehensive Income (Loss) (pre -tax)					1,334
Statement of Operations (Loss) Income			(2,500)		257
Fair Value end of the year	$ 2,312		2,312		7,971
Fair value Available for Sale
Additions during the period			510
Unrealized (loss) gain on derivative instrument	(1)	$ (722)	(865)	1,069
Proceeds from sale of investments	200		3,667	2,155
Unrealized loss on equity securities	(500)		(1,637)
Other comprehensive income (loss)		840		840
Cost of purchase of marketable equity securities			2,000		3,300
Unrealized loss on available-for-sale securities		$ 700	900
Unrealized gain on available-for-sale securities				1,100
Marketable equity securities
Investments rollforward
Opening balance			6,404	6,749	6,749
Additions during the year			1,211
Disposals during the period			(3,666)		(2,163)
Other Comprehensive Income (Loss) (pre -tax)					1,334
Statement of Operations (Loss) Income			(1,637)		484
Fair Value end of the year	$ 2,312		2,312		6,404
Warrants
Investments rollforward
Opening balance			1,567	$ 1,794	1,794
Disposals during the period			(704)
Statement of Operations (Loss) Income			$ (863)		(227)
Fair Value end of the year					$ 1,567