XML 33 R21.htm IDEA: XBRL DOCUMENT v3.5.0.2
Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Number of Stock Options    
Outstanding, beginning of period (in shares) 414,769  
Exercised (in shares) (25,750)  
Outstanding, end of period (in shares) 389,019 414,769
Exercisable (in shares) 333,187  
Weighted Average Exercise Price    
Outstanding, beginning of period (in USD per share) $ 19.07  
Exercised (in USD per share) 15.77  
Outstanding, end of period (in USD per share) 19.29 $ 19.07
Exercisable (in USD per share) $ 18.22  
Weighted Average Remaining Contractual Life (years)    
Outstanding 4 years 7 months 56 days 5 years 29 days
Exercisable 4 years 1 month 18 days  
Aggregate Intrinsic Value    
Outstanding, beginning of period $ 1,814  
Exercised 154  
Outstanding, end of period 1,815 $ 1,814
Exercisable $ 1,815