Common Stock (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 16, 2015	Jul. 23, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Dividends, Common Stock, Cash				$ 11,900	$ 11,300	$ 23,220	$ 21,968	$ 45,800	$ 43,300
Common Stock, Dividends, Per Share, Declared				$ 0.295	$ 0.280	$ 0.575	$ 0.545	$ 1.135	$ 1.075
Scenario, Forecast
Dividends Payable, Date to be Paid	Sep. 30, 2015
Dividends Payable, Date of Record		Sep. 16, 2015
Subsequent Event
Dividends Payable, Date Declared			Jul. 23, 2015
Common Stock, Dividends, Per Share, Declared			$ 0.295