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Earnings Per Share Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Net Income	$ 72,395	$ 60,044	$ 291,380	$ 181,102
Common share information:
Weighted average shares outstanding for basic earnings per share	77,247	77,597	77,249	77,941
Dilutive effect of stock options and restricted stock	299	335	337	378
Weighted average shares outstanding for diluted earnings per share	77,546	77,932	77,586	78,319
Basic earnings per share	$ 0.94	$ 0.77	$ 3.77	$ 2.32
Diluted earnings per share	$ 0.93	$ 0.77	$ 3.76	$ 2.31
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	49	89	36	74

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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