SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2016
Enacted Corporate Tax		35.00%
New Enacted Corporate Tax Rate		21.00%
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 108,367	$ 0
Services Revenues [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 11,100
Deferred Revenue [Domain]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			$ 41,800