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Treasury Stock (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jul. 26, 2017
Equity, Class of Treasury Stock [Line Items]      
Shares available for repurchase (in shares) 148,853    
Shares repurchased (in shares) 239,000 36,000  
Cost of shares repurchased $ 14,885 $ 1,944  
Subsequent Event      
Equity, Class of Treasury Stock [Line Items]      
Shares available for repurchase (in shares)     200,000
Increase in shares available for repurchase (in shares)     51,147