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Common Stock Repurchases - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Common Stock Repurchases (Textual) [Abstract]      
Repurchased shares 340,473 0 0
Common stock purchased for treasury $ 17.2    
Shares remained available for repurchase 100,067    
Repurchase of common stock for employee tax withholding obligations amount, shares 22,358 41,532 25,432
Repurchase of common stock for employee tax withholding obligations amount $ 1.2 $ 2.1 $ 0.7