Share Repurchases (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
May 31, 2015
Common stock authorized for repurchase $ 7,700 $ 7,700    
Number of common stock repurchased (in shares) 193,831 427,646    
Value of common stock repurchased $ 1,500 $ 3,242 $ 2,148  
Maximum        
Common stock authorized for repurchase       $ 20,000