Share-Based Compensation (Summary of Stock Option Activity) (Details) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Shares [Roll Forward]
Outstanding, beginning of period (in shares)	1,450,704
Granted (in shares)	403,260
Exercised (in shares)	(165,876)
Forfeited or Expired (in shares)	(85,326)
Outstanding, end of period (in shares)	1,602,762
Exercisable, end of period (in shares)	416,282	375,795
Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning of period (weighted average exercise price)	$ 21.33
Granted (weighted average exercise price)	34.43
Exercised (weighted average exercise price)	10.34
Forfeited or Expired (weighted average exercise price)	30.63
Outstanding, end of period (weighted average exercise price)	25.27
Exercisable, end of period (weighted average exercise price)	$ 12.42	$ 8.72