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Equity - Restricted Stock (Details) - Restricted stock - 2008 Plan - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Restricted stock activity    
Outstanding at the beginning of the year (in shares) 214,168 165,149
Granted (in shares) 92,150 95,000
Vested (in shares) (118,331) (45,981)
Canceled (in shares) (640)  
Outstanding at the end of the year (in shares) 187,347 214,168
Compensation expense    
Compensation expense, vested awards $ 3,992 $ 3,241
Remaining compensation expense $ 4,221  
2016    
Restricted stock activity    
Outstanding at the end of the year (in shares) 102,060  
Compensation expense    
Remaining compensation expense $ 2,618  
2017    
Restricted stock activity    
Outstanding at the end of the year (in shares) 57,367  
Compensation expense    
Remaining compensation expense $ 1,416  
2018    
Restricted stock activity    
Outstanding at the end of the year (in shares) 27,920  
Compensation expense    
Remaining compensation expense $ 187  
Grant Date Price 36.81 | Three year vesting    
Restricted stock activity    
Granted (in shares)   59,000
Price per share   $ 36.81
Vesting period   3 years
Grant Date Price 38.43 | Three year vesting    
Restricted stock activity    
Granted (in shares)   3,000
Price per share   $ 38.43
Vesting period   3 years
Grant Date Price 40.05 | Three year vesting    
Restricted stock activity    
Granted (in shares)   15,000
Price per share   $ 40.05
Vesting period   3 years
Grant Date Price 40.05 | Vesting Date, June 9, 2015    
Restricted stock activity    
Granted (in shares)   10,500
Price per share   $ 40.05
Grant Date Price 41.34 | Vesting Date, November 12, 2015    
Restricted stock activity    
Granted (in shares)   7,500
Price per share   $ 41.34
Grant Date Price 44.45 | Three year vesting    
Restricted stock activity    
Granted (in shares) 65,750  
Price per share $ 44.45  
Vesting period 3 years  
Grant Date Price 42.30 | Three year vesting    
Restricted stock activity    
Granted (in shares) 18,000  
Price per share $ 42.30  
Vesting period 3 years  
Grant Date Price 42.30 | Vesting Date, June 2, 2016    
Restricted stock activity    
Granted (in shares) 8,400  
Price per share $ 42.30