Share-Based Compensation (Details) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended			3 Months Ended
	May 31, 2014 BoardMembers	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Minimum [Member]	Jun. 30, 2014 Maximum [Member]	Mar. 31, 2014 Stock Options [Member]	Mar. 31, 2014 Performance Share Awards [Member]	Mar. 31, 2014 Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchased During Period, Shares		112,002
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures							76,720	44,321	26,574
Share Based Compensation Arrangement By Share Based Payment Award, Range of Shares, Minimum					0
Share Based Compensation Arrangement By Share Based Payment Award, Range of Shares as Caluclated Using Performance Indicators, Maximum						200.00%
Stock Granted During Period, Value, Share-based Compensation, Gross	$ 300,000						$ 1,500,000	$ 2,500,000	$ 1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term			6 years				3 years		3 years
External Members of the Board of Directors	5
Shares owned by external directors	5,145
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value			$ 20.15				$ 55.49		$ 55.49
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date							Mar. 28, 2024
Treasury Stock Acquired, Average Cost Per Share		$ 55.16
Stock Repurchased During Period, Value		$ 6,200,000	$ (6,178,000)	$ (7,118,000)