Stock-Based Compensation (ESPP - Purchase Option Activity) (Details) (Employee Stock Purchase Plan [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2014
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at March 31, 2014	55
Granted	198
Exercised	(55)
Outstanding at June 30, 2014	198
Outstanding at March 31, 2014, Weighted-Average Exercise Price Per Share	$ 80.77
Granted, Weighted-Average Exercise Price Per Share	$ 91.38
Exercised, Weighted-Average Exercise Price Per Share	$ 80.77
Outstanding at June 30, 2014, Weighted-Average Exercise Price Per Share	$ 91.38