Nature of Operations and Summary of Significant Accounting Policies Treasury Stock (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2018	Jun. 30, 2018
Class of Stock Disclosures [Abstract]
Treasury Stock, Shares	26,257,903	26,107,903
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	3,733,000	3,883,000
Treasury Stock, Value	$ 1,076,536	$ 1,055,260
Treasury Stock, Shares, Acquired	150,000