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NET INCOME (LOSS) PER SHARE - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic net income per share:
Net income (loss)	$ (27,610)	$ 13,295	$ 34,882	$ 35,663
Weighted average common shares outstanding - Basic (in shares)	85,688	85,193	85,536	82,058
Basic net income (loss) per common share (in dollars per share)	$ (0.32)	$ 0.16	$ 0.41	$ 0.43
Diluted net income per share:
Net income (loss)	$ (27,610)	$ 13,295	$ 34,882	$ 35,663
Weighted average common shares outstanding - Basic (in shares)	85,688	85,193	85,536	82,058
Effect of dilutive securities:
Stock options and restricted stock (in shares)	0	1,106	1,045	1,084
Weighted average common shares for diluted earnings per share (in shares)	85,688	86,299	86,581	83,142
Diluted net income (loss) per common share (in dollars per share)	$ (0.32)	$ 0.15	$ 0.40	$ 0.43

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