Nature of Operations and Summary of Significant Accounting Policies Treasury Stock (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Class of Stock Disclosures [Abstract]
Treasury Stock, Shares	25,961,920		25,660,212
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	4,029,000		4,330,000
Treasury Stock, Value	$ 1,036,292		$ 1,006,274
Treasury Stock, Shares, Acquired	302,000
Payments for Repurchase of Common Stock	$ 30,018	$ 103,885