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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NET INCOME (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Net (loss) income	$ (3,576)	$ 27,185	$ (21,055)	$ 8,514
Weighted-average shares:
Basic (in shares)	159,140,254	158,151,747	159,011,741	157,922,075
Effect of dilutive securities from stock options and restricted stock awards (in shares)		4,517,934		4,526,818
Diluted (in shares)	159,140,254	162,669,681	159,011,741	162,448,893
Net (loss) income per share:
Basic (in dollars per share)	$ (0.02)	$ 0.17	$ (0.13)	$ 0.05
Diluted (in dollars per share)	$ (0.02)	$ 0.17	$ (0.13)	$ 0.05

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