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Common Stock Repurchases - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Common Stock Repurchases (Textual) [Abstract]      
Repurchased shares 141,462 448,436  
Common stock purchased for treasury $ 3.8 $ 10.6  
Shares remain available for repurchase 440,540    
Repurchased shares tax withholding 35,649 72,996 50,156
Share repurchased relating to tax withholding requirements $ 1.0 $ 1.8 $ 1.3