EARNINGS PER SHARE - Calculation of Basic and Diluted Weighted Average Shares Outstanding and Earnings Per Share (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, 2016	Dec. 31, 2015	Dec. 31, 2014
Basic:
Net loss	$ (116,406)	$ (89,635)	$ (195,761)	$ (188,784)	$ (318,656)	$ (291,965)	$ (152,906)	$ (327,388)	$ (590,586)	$ (1,090,915)	$ (189,543)
Net income attributable to participating securities									0	0	0
Net loss attributable to common stock - basic									(590,586)	(1,090,915)	(189,543)
Diluted:
Net loss	$ (116,406)	$ (89,635)	$ (195,761)	$ (188,784)	$ (318,656)	$ (291,965)	$ (152,906)	$ (327,388)	(590,586)	(1,090,915)	(189,543)
Net income attributable to participating securities									0	0	0
Net loss attributable to common stock - diluted									$ (590,586)	$ (1,090,915)	$ (189,543)
Weighted average shares (denominator):
Weighted average shares - basic (in shares)									5,591	5,525	5,272
Dilutive effect of stock options (in shares)									0	0	0
Weighted average shares - diluted (in shares)									5,591	5,525	5,272
Basic loss per share (in usd per share)	$ (20.76)	$ (16.01)	$ (35.05)	$ (33.89)	$ (57.63)	$ (52.82)	$ (27.68)	$ (59.33)	$ (105.63)	$ (197.45)	$ (35.95)
Diluted loss per share (in usd per share)	$ (20.76)	$ (16.01)	$ (35.05)	$ (33.89)	$ (57.63)	$ (52.82)	$ (27.68)	$ (59.33)	$ (105.63)	$ (197.45)	$ (35.95)