Stockholders' Equity (Narrative) (Details) (USD $) Share data in Millions, unless otherwise specified	4 Months Ended	6 Months Ended		1 Months Ended
	Jan. 22, 2012	Apr. 15, 2012	Apr. 17, 2011	Nov. 30, 2011 Stock Repurchase Authorization Program Expiring November 2013 [Member]	May 31, 2011 Stock Repurchase Authorization Program Expiring November 2012 [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock, authorized amount				$ 100,000,000	$ 100,000,000
Repurchase of common stock, remaining authorized amount		100,000,000
Common stock repurchased, shares	0.3
Common stock repurchased, aggregate cost	$ 6,400,000	$ 6,901,000	$ 75,000,000