Stock-Based Compensation (Stock Appreciation Rights Award Activity) (Details) (Stock Appreciation Rights (SARs) [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member]
SARs Activity [Roll Forward]
Outstanding, Beginning	389,686	320,336	222,096
Granted	132,566	145,018	126,048
Exercised	(147,148)	(75,668)	(15,370)
Forfeited	0	0	(12,438)
Outstanding, Ending	375,104	389,686	320,336
SARs, Weighted Average Exercise Price [Roll Forward]
Oustanding, Beginning (in usd per share)	$ 20.81	$ 20.17	$ 19.87
Granted (in usd per share)	$ 29.56	$ 21.22	$ 20.57
Exercised (in usd per share)	$ 20.47	$ 18.91	$ 19.58
Forfeited (in usd per share)	$ 0.00	$ 0.00	$ 19.59
Oustanding, Ending (in usd per share)	$ 24.03	$ 20.81	$ 20.17
SARs, Additional Disclosures
Exercisable	56,938	110,292	117,800
Exercisable (in usd per share)	$ 20.95	$ 20.70	$ 19.86