XML 70 R57.htm IDEA: XBRL DOCUMENT v3.3.1.900
Share-Based Compensation - Summary of Unvested Restricted Stock Awards (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Unvested, beginning of period (in shares) | shares 414,846
Granted (in shares) | shares 134,346
Vested (in shares) | shares (115,885)
Forfeited (in shares) | shares (23,284)
Unvested, end of period (in shares) | shares 410,023
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Unvested, beginning of period (weighted average grant date fair value) | $ / shares $ 16.76
Granted (weighted average grant date fair value) | $ / shares 22.22
Vested (weighted average grant date fair value) | $ / shares 15.61
Forfeited (weighted average grant date fair value) | $ / shares 18.46
Unvested, end of period (weighted average grant date fair value) | $ / shares $ 18.78