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UNAUDITED SUPPLEMENTARY QUARTERLY INFORMATION (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
UNAUDITED SUPPLEMENTARY QUARTERLY INFORMATION
Net income (loss)	$ (4,491)	$ 4,208	$ 8,353	$ 12,985	$ (14,988)	$ 2,633	$ (14,116)	$ 6,021	$ (212,775)	$ (13,033)	$ (104,022)	$ 17,887	$ 21,055	$ (20,450)	$ (311,943)
Net (loss) income per share:
Basic (in dollars per share)	$ (0.01)	$ 0.01	$ 0.03	$ 0.04	$ (0.05)	$ 0.01	$ (0.05)	$ 0.02	$ (0.71)	$ (0.04)	$ (0.35)	$ 0.06	$ 0.07	$ (0.07)	$ (1.05)
Diluted (in dollars per share)	$ (0.01)	$ 0.01	$ 0.03	$ 0.04	$ (0.05)	$ 0.01	$ (0.05)	$ 0.02	$ (0.71)	$ (0.04)	$ (0.35)	$ 0.06	$ 0.07	$ (0.07)	$ (1.05)
Weighted average common shares outstanding (thousands) (note 13):
Basic (in shares)	299,518	298,510	298,237	298,242	300,107	300,530	300,530	297,255	299,009	297,164	297,164	297,159	298,772	300,341	297,763
Diluted (in shares)	301,102	301,045	299,791	298,554	300,107	300,530	300,530	297,266	299,009	297,164	297,164	298,410	300,474	300,341	297,763

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