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NET INCOME PER SHARE Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Jun. 15, 2015
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]
Debt Instrument, Convertible, Conversion Price			$ 21.94
Anti-dilutive potential common shares (in thousands of shares)	3,653	5,434
Options
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)	772	2,262
Non-vested restricted stock units
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)	2,881	3,172
Convertible Debt [Member]
Antidilutive Securities Excluded from Computation of Net Loss Per Share [Line Items]
Long-term Debt, Gross				$ 125.0
Debt Instrument, Interest Rate, Stated Percentage				2.00%