Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenues	$ 184,972	$ 195,105	$ 533,683	$ 552,483
Direct operating expenses (including related party expenses of $39,880 and $38,283 for the three months ended March 31, 2020 and 2019, respectively, and $118,767 and $114,586 for the nine months ended March 31, 2020 and 2019, respectively)	83,762	82,085	236,487	230,210
Selling, general and administrative expenses (including related party expenses of $8,369 and $9,739 for the three months ended March 31, 2020 and 2019, respectively, and $20,386 and $21,464 for the nine months ended March 31, 2020 and 2019, respectively)	25,831	28,734	80,173	76,931
Depreciation and amortization	1,716	1,805	5,123	5,650
Operating income	73,663	82,481	211,900	239,692
Other income (expense):
Interest income	900	1,557	3,734	4,571
Interest expense	(9,419)	(11,658)	(30,168)	(35,273)
Debt refinancing expense	0	0	(2,764)	0
Other components of net periodic benefit cost	(258)	(413)	(774)	(1,231)
Nonoperating expense, Total	(8,777)	(10,514)	(29,972)	(31,933)
Income from operations before income taxes	64,886	71,967	181,928	207,759
Income tax expense	(18,616)	(17,732)	(52,627)	(62,756)
Net income	$ 46,270	$ 54,235	$ 129,301	$ 145,003
Basic
Basic	$ 0.77	$ 0.72	$ 1.98	$ 1.93
Diluted
Diluted	$ 0.77	$ 0.72	$ 1.97	$ 1.92
Weighted-average number of common shares outstanding:
Basic (in shares)	60,011	75,152	65,194	75,041
Diluted (in shares)	60,315	75,739	65,553	75,712