Earnings Per Share Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share, Basic and Diluted [Abstract]
Net Income	$ 155,574	$ 58,814	$ 218,985	$ 121,058
Common share information:
Weighted average shares outstanding for basic earnings per share	77,218	77,814	77,250	78,114
Dilutive effect of stock options and restricted stock	347	366	356	398
Weighted average shares outstanding for diluted earnings per share	77,565	78,180	77,606	78,512
Basic earnings per share	$ 2.01	$ 0.76	$ 2.83	$ 1.55
Diluted earnings per share	$ 2.01	$ 0.75	$ 2.82	$ 1.54
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	32	0	32