Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Activity (Details)

v3.3.0.814
Share-Based Compensation - Activity (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Restricted Stock Awards, Number of Shares    
Replacement awards (in shares) | shares 468,700  
Granted (in shares) | shares 131,000  
Vested (in shares) | shares (21,000)  
Forfeited (in shares) | shares (900)  
Balance at end of period (in shares) | shares 577,800 577,800
Restricted Stock Awards, Weighted Average Grant Date Fair Value Per Share    
Replacement awards (in dollars per share) $ 20.32  
Granted (in dollars per share) 27.49  
Vested (in dollars per share) 23.81  
Forfeited (in dollars per share) 17.91  
Balance at end of period (in dollars per share) $ 21.82 $ 21.82
Stock Options, Number of Shares    
Replacement awards (in shares) | shares 162,500  
Granted (in shares) | shares 225,100  
Balance at end of period (in shares) | shares 387,600 387,600
Stock Options, Weighted Average Grant Date Fair Value Per Share    
Replacement awards (in dollars per share) $ 7.84  
Granted (in dollars per share) 10.44  
Balance at end of period (in dollars per share) 9.35 $ 9.35
Stock Options, Weighted Average Exercise Price Per Share    
Replacement awards (in dollars per share) 19.78  
Granted (in dollars per share) 27.10  
Balance at end of period (in dollars per share) $ 24.03 $ 24.03
Stock options, additional disclosures    
Aggregate intrinsic value | $ $ 2,689,200 $ 2,689,200
Restricted Stock Awards    
Restricted stock awards, additional disclosures    
Unrecognized compensation expense related to unvested restricted stock awards | $ 9,800,000 $ 9,800,000
Weighted average remaining vesting period   1 year 8 months 12 days
Stock Options    
Stock options, additional disclosures    
Unrecognized compensation expense related to unvested stock options | $ $ 3,200,000 $ 3,200,000
Weighted average remaining vesting period   2 years 2 months 12 days
Weighted average remaining contractual life   8 years 9 months 18 days
Assumptions used to estimate the fair values of the options granted:    
Risk free interest rate (as a percent)   1.82%
Expected volatility (as a percent)   37.00%
Expected life (in years)   6 years
Dividend yield (as a percent)   0.00%
Weighted-average estimated fair value of options granted during the year (in dollars per share)   $ 10.44