Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenues	$ 187,730	$ 192,914	$ 348,711	$ 357,378
Direct operating expenses (including related party expenses of $39,884 and $38,211 for the three months ended December 31, 2019 and 2018, respectively, and $78,887 and $76,303 for the six months ended December 31, 2019 and 2018, respectively)	84,065	81,470	152,725	148,125
Selling, general and administrative expenses (including related party expenses of $8,826 and $8,645 for the three months ended December 31, 2019 and 2018, respectively, and $12,017 and $11,725 for the six months ended December 31, 2019 and 2018, respectively)	32,022	31,294	54,342	48,197
Depreciation and amortization	1,680	1,800	3,407	3,845
Operating income	69,963	78,350	138,237	157,211
Other income (expense):
Interest income	906	1,422	2,834	3,014
Interest expense	(9,934)	(11,693)	(20,749)	(23,615)
Debt refinancing expense	(2,764)	0	(2,764)	0
Other components of net periodic benefit cost	(258)	(413)	(516)	(818)
Nonoperating expense, Total	(12,050)	(10,684)	(21,195)	(21,419)
Income from operations before income taxes	57,913	67,666	117,042	135,792
Income tax expense	(17,949)	(23,828)	(34,011)	(45,024)
Net income	$ 39,964	$ 43,838	$ 83,031	$ 90,768
Basic
Basic	$ 0.66	$ 0.58	$ 1.23	$ 1.21
Diluted
Diluted	$ 0.66	$ 0.58	$ 1.22	$ 1.20
Weighted-average number of common shares outstanding:
Basic (in shares)	60,452	75,079	67,758	74,987
Diluted (in shares)	60,825	75,737	68,144	75,715