FINANCING ARRANGEMENTS Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term obligations, at par	$ 1,395,000	$ 1,395,000
Unamortized debt issuance costs	(12,457)	(14,855)
Long-term obligations, at carrying value	1,382,543	1,380,145
Senior secured notes | Senior unsecured notes, at 5.25%, due August 1, 2020
Debt Instrument [Line Items]
Long-term obligations, at par	800,000	800,000
Senior secured notes | Senior unsecured notes, at 5.125%, due June 1, 2021
Debt Instrument [Line Items]
Long-term obligations, at par	$ 595,000	$ 595,000