EARNINGS PER SHARE (Details) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares	Sep. 30, 2016 USD ($) $ / shares	Jun. 30, 2016 USD ($) $ / shares	Mar. 31, 2016 USD ($) $ / shares	Dec. 31, 2015 USD ($) $ / shares	Sep. 30, 2015 USD ($) $ / shares	Jun. 30, 2015 USD ($) $ / shares	Mar. 31, 2015 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares
Income (loss) from continuing operations:
Income (loss) from continuing operations									$ (198,950)	$ (745,547)	$ 16,982
Less: undistributed income (loss) to unvested restricted stock									0	0	315
Undistributed income (loss) to common shareholders									$ (198,950)	$ (745,547)	$ 16,667
Basic income (loss) per common share from continuing operations (in dollars per share) | $ / shares									$ (4.04)	$ (15.57)	$ 0.42
Diluted income (loss) per common share from continuing operations (in dollars per share) | $ / shares									$ (4.04)	$ (15.57)	$ 0.41
Income (loss) from discontinued operations:
Gain from discontinued operations									$ 0	$ 0	$ 3,301
Less: undistributed income to unvested restricted stock									0	0	62
Undistributed income (loss) to common shareholders									$ 0	$ 0	$ 3,239
Basic income per common share from discontinued operations (in dollars per share) | $ / shares									$ 0.00	$ 0.00	$ 0.08
Diluted income from discontinued operations (in dollars per share) | $ / shares									$ 0.00	$ 0.00	$ 0.08
Net income (loss):
Net income (loss)	$ (67,334)	$ (34,902)	$ (49,477)	$ (47,237)	$ (573,663)	$ (112,299)	$ (41,164)	$ (18,421)	$ (198,950)	$ (745,547)	$ 20,283
Less: undistributed income (loss) to unvested restricted stock									0	0	377
Undistributed income (loss) to common shareholders									$ (198,950)	$ (745,547)	$ 19,906
Basic net income (loss) per common share (in dollars per share) | $ / shares		$ (0.71)	$ (1.00)	$ (0.96)	$ (12.08)	$ (2.25)	$ (0.83)	$ (0.41)	$ (4.04)	$ (15.57)	$ 0.50
Diluted net income (loss) per common share (in dollars per share) | $ / shares	$ (1.37)	$ (0.71)	$ (1.00)	$ (0.96)	$ (12.08)	$ (2.25)	$ (0.83)	$ (0.41)	$ (4.04)	$ (15.57)	$ 0.49
Weighted-average shares outstanding - basic (in shares) | shares									49,268,000	47,874,000	40,139,000
Add: dilutive effect of contingent PSUs (in shares) | shares									0	0	151,000
Weighted-average shares outstanding - diluted (in shares) | shares									49,268,000	47,874,000	40,290,000
Antidilutive securities excluded from EPS calculation (in shares) | shares									519,362	277,634	0
PSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards earned during performance cycle									0
PSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards earned during performance cycle									2