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Treasury Stock (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Nov. 02, 2016
Subsequent Event [Line Items]      
Shares available for repurchase (in shares) 375,000    
Shares repurchased (in shares) 39,531 1,593,420  
Cost of shares repurchased $ 2,188 $ 78,708  
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Shares available for repurchase (in shares)     500,000
Increase in shares available for repurchase (in shares)     125,000