Earnings Per Share Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Net Income	$ 68,089	$ 161,243	$ 151,640	$ 228,113
Common share information:
Weighted average shares outstanding for basic earnings per share	77,216	77,218	77,202	77,250
Dilutive effect of stock options and restricted stock	193	347	272	356
Weighted average shares outstanding for diluted earnings per share	77,409	77,565	77,474	77,606
Basic earnings per share	$ 0.88	$ 2.09	$ 1.96	$ 2.95
Diluted earnings per share	$ 0.88	$ 2.08	$ 1.96	$ 2.94
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	5	0