SEVERANCE COSTS AND AGREEMENTS WITH EXECUTIVE OFFICERS (Activity Relating to Reserves for Outsourcing and RIFs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 16	$ 12,996	$ 0
Spinoff Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	8,218
Spinoff Share Based Expense [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	4,778
Severance Reserve Outsourcing RIF [Member]
Activity for the year ended December 31
Beginning balance		0
Provision		8,218
Utilized	(6,440)	(524)
Ending balance			$ 0
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	12,996
Severance Reserve Outsourcing [Member]
Activity for the year ended December 31
Beginning balance	7,694
Ending balance	$ 1,254	$ 7,694