SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2011	Dec. 31, 2010
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 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
Accounting Standards Update No. 2009-14 [Member]
New Accounting Pronouncement Adoption, Percent Revenue Recognized at Billing			70.00%	30.00%