Earnings Per Share (Narrative) (Details) (USD $)	6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2010 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2010 Restricted Stock [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2010 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2010 Stock Options [Member]	Dec. 31, 2011 Convertible Senior Notes [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Common stock outstanding and not included in the computation of diluted earnings per share			8,274	18,404	4,341	13,733	1,767,021	1,752,421	1,699,565	1,702,404
Initial conversion price of the convertible senior notes	$ 104
Amount of convertible senior notes	$ 1,000
Convertible senior notes, interest rate											1.25%
Convertible senior notes outstanding	$ 400,000,000	$ 400,000,000									$ 400,000,000
Debt instrument, maturity date											Oct. 15, 2012