Stock-based Compensation (Summary of Stock Option Plan Activity) (Details) - $ / shares		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Stock-based Compensation [Abstract]
Outstanding, beginning of period, Shares		1,619,948	2,236,620
Granted, Shares		524,940	663,900
Exercised, Shares		(564,389)	(377,188)
Forfeited or cancelled, Shares		(207,203)	(117,640)
Outstanding, end of period, Shares	[1]	1,373,296	2,405,692
Outstanding, beginning of period, Weighted Average Exercise Price		$ 56.57	$ 46.61
Granted, Weighted Average Exercise Price		82.74	70.34
Exercised, Weighted Average Exercise Price		48.80	45.66
Forfeited or cancelled, Weighted Average Exercise Price		68.23	53.39
Outstanding, end of period, Weighted Average Exercise Price	[1]	$ 68.01	$ 52.98

[1] Included in the table above in outstanding shares for the nine months ended September 30, 2015 were 128,334 options that were previously granted to the Company's former CEO. These options subsequently forfeited in 2016 and are included above in the amounts forfeited or cancelled for the nine months ended September 30, 2016.