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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 |

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