Subsequent Event (Details) (USD $)	1 Months Ended	2 Months Ended	10 Months Ended	1 Months Ended
	Mar. 31, 2015	Feb. 18, 2015	Dec. 31, 2014	May 04, 2015
Subsequent Event [Line Items]
Stock Repurchased and Retired During Period, Shares	84,000	335,251	910,990
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock Repurchased and Retired During Period, Shares				52,775
Stock Repurchased and Retired During Period, Average Price Per Share				$ 36.79