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Nature of Operations and Summary of Significant Accounting Policies Treasury Stock (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Class of Stock Disclosures [Abstract]    
Treasury Stock, Shares 26,858,000 26,508,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 3,133,000 3,483,000
Treasury Stock, Value $ 1,161,334 $ 1,110,124
Treasury Stock, Shares, Acquired 350,000