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SHAREHOLDERS’ EQUITY AND SHARE-BASED COMPENSATION Black-Scholes and Binomial model Assumptions and Summary of Activity related to our stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Option      
Summary of activity related to our stock      
Outstanding at the beginning of the period (in shares) 3,163,125    
Exercised (in shares) (79,726)    
Forfeited (in shares) (46,950)    
Outstanding at the end of the period (in shares) 3,129,949   3,163,125
Exercisable at the end of the period (in shares) 2,286,429    
Weighted average exercise price      
Outstanding at the beginning of the period (in usd per share) $ 20.13    
Exercised (in usd per share) 12.36    
Forfeited (in usd per share) 25.32    
Outstanding at the end of the period (in usd per share) 20.47   $ 20.13
Exercisable at the end of the period (in usd per share) $ 15.19    
Weighted average contractual term      
Weighted average contractual term 4 years 5 months 5 days   4 years 11 months 9 days
Exercisable at the end of the period 2 years 10 months 2 days    
Aggregate intrinsic value      
Aggregate intrinsic value, beginning balance (in dollars) $ 35,842    
Aggregate intrinsic value, ending balance (in dollars) 34,598   $ 35,842
Exercisable at the end of the period (in dollars) $ 32,079    
Black Scholes      
Equity And Share-Based Compensation      
Risk-free interest rate (%)   1.78%  
Expected stock price volatility (%)   57.60%  
Expected option life (in years)   6 years 3 months  
Share Price     $ 16.05
Black Scholes | Minimum      
Equity And Share-Based Compensation      
Risk-free interest rate (%) 1.25% 1.50%  
Expected stock price volatility (%) 59.75% 55.06%  
Expected option life (in years) 6 years 6 years  
Share Price $ 11.15   10.01
Black Scholes | Maximum      
Equity And Share-Based Compensation      
Risk-free interest rate (%) 1.89%    
Expected stock price volatility (%) 62.14%    
Expected option life (in years) 6 years 3 months    
Share Price $ 17.09    
Binomial | Minimum      
Equity And Share-Based Compensation      
Risk-free interest rate (%) 0.23% 0.02%  
Expected stock price volatility (%) 59.76% 55.06%  
Expected option life (in years) 4 years 6 months 15 days 4 years 6 months 15 days  
Share Price $ 11.06   9.91
Binomial | Maximum      
Equity And Share-Based Compensation      
Risk-free interest rate (%) 1.97% 2.26%  
Expected stock price volatility (%) 62.14% 57.60%  
Expected option life (in years) 4 years 10 months 17 days 4 years 10 months 17 days  
Share Price $ 17.58   $ 16.13