Stock Repurchases (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 17, 2012	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Stock Repurchases [Abstract]
Shares remaining available for repurchase		3,699,525
Outstanding shares of common stock repurchased	928,500	2,097,200	2,000,000
Total cost	$ 61,261	$ 146,657	$ 139,097	$ 143,604
Average cost per share	$ 65.98	$ 69.93	$ 69.55