Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Activity (Details)

v3.3.1.900
Share-Based Compensation - Activity (Details)
6 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Stock options, additional disclosures    
Fair value of restricted stock awards | $   $ 500,000
Fair value of stock options | $   $ 0
Weighted average remaining contractual term for vested but unexercised stock options   4 years 9 months 18 days
Restricted Stock Awards    
Restricted Stock Awards, Number of Shares    
Replacement awards (in shares) | shares 468,700  
Granted (in shares) | shares 143,000  
Vested (in shares) | shares (21,000)  
Forfeited (in shares) | shares (4,100)  
Balance at end of period (in shares) | shares 586,600 586,600
Restricted Stock Awards, Weighted Average Grant Date Fair Value Per Share    
Replacement awards (in dollars per share) $ 20.32  
Granted (in dollars per share) 27.63  
Vested (in dollars per share) 23.81  
Forfeited (in dollars per share) 21.49  
Balance at end of period (in dollars per share) $ 21.97 $ 21.97
Restricted stock awards, additional disclosures    
Unrecognized compensation expense related to unvested restricted stock awards | $ $ 9,100,000 $ 9,100,000
Weighted average remaining vesting period   1 year 6 months
Stock Options    
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 | $ $ 2,611,700 $ 2,611,700
Unrecognized compensation expense related to unvested stock options | $ $ 3,000,000 $ 3,000,000
Weighted average remaining vesting period   2 years
Weighted average remaining contractual life   8 years 7 months 6 days
Exercisable, Number of shares | shares 1,900 1,900
Exercisable, Weighted Average Grant Date Fair Value Per Share   $ 3.88
Exercisable Weighted Average Exercise Price Per Share $ 11.08 $ 11.08
Exercisable, Aggregate Intrinsic Value | $ $ 37,900 $ 37,900
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