Share-Based Compensation (Summary of Stock Option Activity) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Shares [Roll Forward]
Outstanding, beginning of period (in shares)	1,450,704
Granted (in shares)	321,390
Exercised (in shares)	(92,065)
Forfeited or Expired (in shares)	(28,132)
Outstanding, end of period (in shares)	1,651,897
Exercisable, end of period (in shares)	359,656	358,269
Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning of period (weighted average exercise price)	$ 21.33
Granted (weighted average exercise price)	34.14
Exercised (weighted average exercise price)	9.76
Forfeited or Expired (weighted average exercise price)	28.93
Outstanding, end of period (weighted average exercise price)	24.34
Exercisable, end of period (weighted average exercise price)	$ 11.96	$ 8.48