INCOME TAXES Effective Rate Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Income taxes at Netherlands rates (25%)		$ (31,206)	$ (18,378)	$ 43,251
Jurisdictional differences in tax rates		10,384	7,303	(41,858)
Effective Income Tax Rate Reconciliation, Non-deductible Interest, Amount		(2,455)	(248)	(796)
Losses expired		(7,111)	(7,583)	(1,847)
Change in valuation allowance (1)	[1]	26,042	(6,242)	(5,863)
Effective Income Tax Rate Reconciliation, Unrecognized Tax Benefits, Amount		1,077	0	(925)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	[1]	(21,982)	0	575
Non-deductible expenses		(879)	207	921
Other		(1,698)	2,437	(97)
Provision for income taxes		$ (27,828)	$ (22,504)	$ (6,639)

[1] (1) The effect of change in tax rate in 2018 is the impact of tax rates enacted in the Netherlands on the tax benefit of loss carry-forwards. The tax benefit