Share-Based Compensation (Summary of Stock Option Activity) (Details) (USD $)	6 Months Ended
	Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding, beginning of period (in shares)	1,115,513
Granted (in shares)	37,500
Exercised (in shares)	(99,645)
Forfeited or Expired (in shares)	(22,575)
Outstanding, end of period (in shares)	1,030,793
Exercisable, end of period (in shares)	487,628
Outstanding, beginning of period (weighted average exercise price)	$ 10.15
Granted (weighted average exercise price)	$ 16.16
Exercised (weighted average exercise price)	$ 7.54
Forfeited or Expired (weighted average exercise price)	$ 11.31
Outstanding, end of period (weighted average exercise price)	$ 10.58
Exercisable, end of period (weighted average exercise price)	$ 8.58