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CAPITAL STOCK AND SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Employee Stock Purchase Plan Activity
Employee Stock Purchase Plan Period Shares Issued Price
2013 and Prior 2,755,337 $13.67
January 1, 2014 to March 31, 2014 52,718  12.66
April 1, 2014 to June 30, 2014 38,679  14.23
July 1, 2014 to September 30, 2014 32,573  17.14
October 1, 2014 to December 31, 2014 20,221  24.95
January 1, 2015 to March 31, 2015 24,368  22.76
April 1, 2015 to June 30, 2015 15,750  33.77
July 1, 2015 to September 30, 2015 18,984  32.27
October 1, 2015 to December 31, 2015 19,082  33.42
  2,977,712   
      
Stock Options Activity
Stock Options
     
We use the Black-Scholes option pricing model to estimate the fair value of our stock options. There were no stock options granted during 2013; there were 590,647 and 250,000 options granted during 2015 and 2014, respectively. Stock option compensation expense included in general and administrative expense in our accompanying consolidated statements of operations was $3.8 million and $0.1 million for 2015 and 2014, respectively.
     
The fair value of the 2015 awards were estimated using the following assumptions:
     
 Risk Free Rate 1.46% - 1.93% 
 Expected Volatility 53.87 % - 58.05% 
 Expected Term 5.50 - 6.76 years 
 Weighted Average Fair Value $13.45 - $23.21 
     
We used the simplified method to estimate the expected term for the stock options granted during 2015.

The following table presents our stock option activity for 2015: 
   Number of Shares Weighted Average Exercise Price Weighted Average Contractual Life (Years) 
Outstanding options at January 1, 2015  277,536 $26.40 8.99 
 Granted 590,647  31.73   
 Exercised (15,380)  25.93   
 Canceled, forfeited or expired (14,309)  25.16   
Outstanding options at December 31, 2015  838,494 $30.18 9.31 
Exercisable options at December 31, 2015  62,500 $26.65 8.96 
          
The aggregate intrinsic value of our outstanding options and exercisable options at December 31, 2015 was $8.1 million and $0.8 million, respectively. Total intrinsic value of options exercised was $0.2 million, $0.1 million and $0.2 million for 2015, 2014 and 2013, respectively.
          
The following table presents our non-vested stock option award activity for 2015: 
   Number of Shares Weighted Average Grant Date Fair Value   
        
Non-vested stock options at January 1, 2015 250,000 $26.65   
 Granted 590,647  31.73   
 Vested (62,500)  26.65   
 Forfeited (2,153)  43.63   
Non-vested stock options at December 31, 2015  775,994 $ 30.47   
          
At December 31, 2015, there was $9.8 million of unrecognized compensation cost related to stock options that we expect to be recognized over a weighted-average period of 2.6 years.
Non-Vested Stock Activity
        
Non-Vested Stock
        
We issue shares of non-vested stock with vesting terms ranging from one to six years. The compensation expense is determined based on the market price of our common stock at the date of grant applied to the total number of shares that are anticipated to fully vest. Non-vested stock compensation expense included in general and administrative expenses in our accompanying consolidated statements of operations was $5.0 million, $4.6 million and $5.2 million for 2015, 2014 and 2013, respectively.
        
The following table presents our non-vested stock award activity for 2015:
   Number of Shares Weighted Average Grant Date Fair Value 
Non-vested stock at January 1, 2015  917,959 $15.17 
 Granted  93,256  28.48 
 Vested (355,396)  14.69 
 Canceled, forfeited or expired (154,931)  14.34 
Non-vested stock at December 31, 2015  500,888 $18.24 
        
The weighted average grant date fair value of non-vested stock granted was $28.48, $16.38 and $10.91 in 2015, 2014, and 2013, respectively.
        
At December 31, 2015, there was $4.1 million of unrecognized compensation cost related to non-vested stock award payments that we expect to be recognized over a weighted average period of 1.4 years.
Non-Vested Stock Unity Activity
        
Non-Vested Stock Units - Service-Based
        
We issue non-vested stock unit awards that are service-based, performance-based or a combination of both with vesting terms ranging from one to six years. Based on the terms and conditions of these awards, we determine if the awards should be recorded as either equity or liability instruments. The compensation expense is determined based on the market price of our common stock at the date of grant, applied to the total number of units that are anticipated to vest, unless the award specifies differently. We account for such awards similar to our non-vested stock awards; however, no shares of stock are issued to the recipient until the stock unit awards have vested and after the pre-determined delivery date has occurred. Service-based non-vested stock unit compensation expense included in general and administrative expenses in our accompanying consolidated statements of operations was $1.0 million for 2015.
       
        
        
The following table presents our service-based non-vested stock units activity for 2015:
   Number of Shares Weighted Average Grant Date Fair Value 
Non-vested stock units at January 1, 2015  - $0.00 
 Granted  186,314  37.98 
 Vested 0  0 
 Canceled, forfeited or expired (2,982)  43.63 
Non-vested stock units at December 31, 2015  183,332 $37.89 
        
The weighted average grant date fair value of service-based non-vested stock units granted was $37.98 in 2015.
        
At December 31, 2015, there was $5.9 million of unrecognized compensation cost related to our service-based non-vested stock units that we expect to be recognized over a weighted average period of 2.7 years.

        
The following table presents our performance-based non-vested stock units activity for 2015:
   Number of Shares Weighted Average Grant Date Fair Value 
Non-vested stock units at January 1, 2015  - $0.00 
 Granted  154,732   39.54 
 Vested  -   - 
 Canceled, forfeited or expired  (3,669)  43.63 
Non-vested stock units at December 31, 2015  151,063 $39.44 

 Forward Interest Rate 0.327 % - 1.460% 
 Expected Volatility 54.38% 
 Requisite Service Period 3 years 
 Fair Value $ 10.51 

        
The following table presents our market-based non-vested stock units activity for 2015:
   Number of Shares Weighted Average Grant Date Fair Value 
Non-vested stock units at January 1, 2015  225,745 $10.51 
 Granted  -   - 
 Vested  -   - 
 Canceled, forfeited or expired  (61,211)  10.51 
Non-vested stock units at December 31, 2015  164,534 $10.51