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COMMON STOCK PLANS - 2004 Stock Appreciation Rights Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based compensation expense $ 15,402 $ 19,641 $ 12,910
Stock Appreciation Rights      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based compensation expense (500) $ 2,600 $ (3,200)
Intrinsic value of stock options exercised during period 34    
Settlement of stock appreciation rights $ 23    
Stock Appreciation Rights | 2004 Stock Appreciation Rights Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Remaining requisite service period (in years) 3 years    
Shares      
Outstanding, Beginning of Period (in shares) 252,529 264,867 275,150
Exercised/forfeited (in shares) (12,285) (12,338) (10,283)
Outstanding, End of Period (in shares) 240,244 252,529 264,867
Weighted Average Exercise Price      
Outstanding, Beginning of Period, Weighted Average Exercise Price (in dollars per share) $ 52.46 $ 52.88 $ 52.96
Exercised/forfeited, Weighted Average Exercise Price (in dollars per share) 50.43 61.51 55.18
Outstanding, End of Period, Weighted Average Exercise Price (in dollars per share) $ 52.56 $ 52.46 $ 52.88
1/22/2014 | Stock Appreciation Rights | 2004 Stock Appreciation Rights Plan | Originally reported      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Awards granted (in shares) 46,710    
Fair market value of stock option at grant (in dollars per share) $ 11.53    
Expected life of award 3 years 11 days    
Risk-free interest rate (in percentage) 1.98%    
Annualized volatility rate (in percentage) 38.10%    
Dividend yield (in percentage) 0.00%    
1/24/2013 | Stock Appreciation Rights | 2004 Stock Appreciation Rights Plan | Originally reported      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Awards granted (in shares) 63,436    
Fair market value of stock option at grant (in dollars per share) $ 18.89    
Expected life of award 2 years 6 months 11 days    
Risk-free interest rate (in percentage) 1.92%    
Annualized volatility rate (in percentage) 38.10%    
Dividend yield (in percentage) 0.00%    
1/26/2011 | Stock Appreciation Rights | 2004 Stock Appreciation Rights Plan | Originally reported      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Awards granted (in shares) 182,199    
Fair market value of stock option at grant (in dollars per share) $ 12.54    
Expected life of award 1 year 6 months 16 days    
Risk-free interest rate (in percentage) 1.86%    
Annualized volatility rate (in percentage) 38.10%    
Dividend yield (in percentage) 0.00%    
1/27/2010 | Stock Appreciation Rights | 2004 Stock Appreciation Rights Plan | Originally reported      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Awards granted (in shares) 171,749    
Fair market value of stock option at grant (in dollars per share) $ 15.12    
Expected life of award 1 year 15 days    
Risk-free interest rate (in percentage) 1.77%    
Annualized volatility rate (in percentage) 38.10%    
Dividend yield (in percentage) 0.00%    
1/28/2009 | Stock Appreciation Rights | 2004 Stock Appreciation Rights Plan | Originally reported      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Awards granted (in shares) 305,257    
Fair market value of stock option at grant (in dollars per share) $ 28.06    
Expected life of award 6 months 15 days    
Risk-free interest rate (in percentage) 1.54%    
Annualized volatility rate (in percentage) 38.10%    
Dividend yield (in percentage) 0.00%    
2/4/2008 | Stock Appreciation Rights | 2004 Stock Appreciation Rights Plan | Originally reported      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Awards granted (in shares) 67,093    
Fair market value of stock option at grant (in dollars per share) $ 0.25    
Expected life of award 18 days    
Risk-free interest rate (in percentage) 1.25%    
Annualized volatility rate (in percentage) 38.10%    
Dividend yield (in percentage) 0.00%    
Workforce Reduction | 1/24/2013 | Stock Appreciation Rights | 2004 Stock Appreciation Rights Plan      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Awards granted (in shares) 20,218    
Fair market value of stock option at grant (in dollars per share) $ 16.21    
Expected life of award 1 year 7 months 17 days    
Risk-free interest rate (in percentage) 1.86%    
Annualized volatility rate (in percentage) 38.10%    
Dividend yield (in percentage) 0.00%    
San Juan Basin properties | 1/22/2014, Modified | Stock Appreciation Rights | 2004 Stock Appreciation Rights Plan      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Awards granted (in shares) 15,517    
Fair market value of stock option at grant (in dollars per share) $ 6.92    
Expected life of award 1 year 7 months 17 days    
Risk-free interest rate (in percentage) 1.86%    
Annualized volatility rate (in percentage) 38.10%    
Dividend yield (in percentage) 0.00%    
San Juan Basin properties | 1/22/2014, Modified, Tranche One | Stock Appreciation Rights | 2004 Stock Appreciation Rights Plan      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Awards granted (in shares) 522    
Fair market value of stock option at grant (in dollars per share) $ 4.93    
Expected life of award 1 year 1 month 17 days    
Risk-free interest rate (in percentage) 1.79%    
Annualized volatility rate (in percentage) 38.10%    
Dividend yield (in percentage) 0.00%    
San Juan Basin properties | 1/24/2013, Modified | Stock Appreciation Rights | 2004 Stock Appreciation Rights Plan      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Awards granted (in shares) 768    
Fair market value of stock option at grant (in dollars per share) $ 14.43    
Expected life of award 1 year 1 month 17 days    
Risk-free interest rate (in percentage) 1.79%    
Annualized volatility rate (in percentage) 38.10%    
Dividend yield (in percentage) 0.00%    
San Juan Basin properties | 1/24/2013, Modified, Tranche One | Stock Appreciation Rights | 2004 Stock Appreciation Rights Plan      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Awards granted (in shares) 3,578    
Fair market value of stock option at grant (in dollars per share) $ 11.69    
Expected life of award 6 months    
Risk-free interest rate (in percentage) 1.53%    
Annualized volatility rate (in percentage) 38.10%    
Dividend yield (in percentage) 0.00%    
Black Warrior Basin | 1/26/2011 | Stock Appreciation Rights | 2004 Stock Appreciation Rights Plan      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Awards granted (in shares) 7,785    
Fair market value of stock option at grant (in dollars per share) $ 7.64    
Expected life of award 6 months    
Risk-free interest rate (in percentage) 1.53%    
Annualized volatility rate (in percentage) 38.10%    
Dividend yield (in percentage) 0.00%