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Equity - Restricted Stock (Details) - Restricted stock - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Restricted stock awards    
Compensation expense, vested awards $ 986 $ 978
Nonvested awards    
Number of Awards 193,266  
Remaining compensation expense $ 6,059  
2015 Plan    
Restricted stock awards    
Number of shares granted 65,300  
Granted (in dollars per share) $ 43.24  
Vesting period 3 years  
2008 Plan    
Restricted stock awards    
Number of shares cancelled (in shares)   640
Number of shares granted   65,750
Granted (in dollars per share)   $ 44.45
Vesting period   3 years
2016    
Nonvested awards    
Number of Awards 44,480  
Remaining compensation expense $ 2,519  
2017    
Nonvested awards    
Number of Awards 77,663  
Remaining compensation expense $ 2,335  
2018    
Nonvested awards    
Number of Awards 49,352  
Remaining compensation expense $ 1,127  
2019    
Nonvested awards    
Number of Awards 21,771  
Remaining compensation expense $ 78