Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2011	Jun. 30, 2011
Consolidated Balance Sheets
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares outstanding	54,558,253	54,231,787
Exchangeable, shares issued	1,806,649	1,806,649
Exchangeable, shares redeemed	992,094	900,854