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STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding Beginning Balance, Shares [1] 3,685,125  
Granted, Shares 12,754  
Exercised, Shares (282,371)  
Expired, Shares 0  
Forfeited, Shares (1,030)  
Outstanding Ending Balance, Shares 3,414,478 [2] 3,685,125 [1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Beginning, Weighted-Average Exercise Price (in usd per share) [1] $ 12.45  
Granted, Weighted-Average Exercise Price (in usd per share) 20.34  
Exercised, Weighted-Average Exercise Price (in usd per share) 9.78  
Expired, Weighted-Average Exercise Price (in usd per share) 0.00  
Forfeited, Weighted-Average Exercise Price (in usd per share) 11.55  
Ending, Weighted-Average Exercise Price (in usd per share) $ 12.71 [2] $ 12.45 [1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Outstanding, Weighted- Average Remaining Contractual Term (years) 5 years 11 months 8 days [2] 6 years 18 days [1]
Outstanding, Aggregate Intrinsic Value [1],[3] $ 29,142  
Outstanding, Aggregate Intrinsic Value [3] $ 27,677 [2] $ 29,142 [1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested [Abstract]    
Vested, shares 2,438,080  
Vested, Weighted-Average Exercise Price (in usd per share) $ 11.10  
Vested, Weighted-Average Remaining Contractual Term 4 years 11 months 12 days  
Vested, Aggregate Intrinsic Value $ 23,232  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number [2],[4] 3,316,081  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price [2],[4] $ 12.72  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term [2],[4] 5 years 11 months 12 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value [2],[3],[4] $ 26,816  
Fair value valuation, estimated fair market value of stock (in dollars per share) $ 20.51 $ 20.04
Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding Beginning Balance, Shares 980,671  
Outstanding Ending Balance, Shares 978,717 980,671
[1] The total includes 980,671 performance-based options at December 31, 2016 which had not vested based on their performance criteria.
[2] The total includes 978,717 performance-based options which had vested based on achievement of their rate of return performance criteria during the three months ended March 31, 2017.
[3] Calculated using the fair market value per-share of our common stock as of March 31, 2017 and December 31, 2016 of $20.51, and $20.04, respectively.
[4] Outstanding options, net of expected forfeitures.