Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements Of Operations [Abstract]
Revenues (including related party revenues of $41,537 and $41,491 for the three months ended December 31, 2011 and 2010, respectively, and $81,495 and $81,124 for the six months ended December 31, 2011 and 2010, respectively)	$ 373,007	$ 432,674	$ 550,646	$ 623,504
Operating expenses:
Direct operating (including related party expenses of $3,605 and $4,318 for the three months ended December 31, 2011 and 2010, respectively, and $6,538 and $6,958 for the six months ended December 31, 2011 and 2010, respectively)	224,914	284,512	296,398	365,528
Selling, general and administrative (including related party expenses of $2,564 and $2,429 for the three months ended December 31, 2011 and 2010, respectively, and $4,547 and $4,987 for the six months ended December 31, 2011 and 2010, respectively)	76,043	81,574	139,471	151,631
Depreciation and amortization (including impairments)	24,094	14,148	40,458	27,647
Operating expenses, Total	325,051	380,234	476,327	544,806
Operating income	47,956	52,440	74,319	78,698
Other income (expense):
Interest income	580	648	1,127	1,267
Interest expense	(1,891)	(1,777)	(3,640)	(3,618)
Miscellaneous		874		1,924
Nonoperating income (expense), Total	(1,311)	(255)	(2,513)	(427)
Income from operations before income taxes	46,645	52,185	71,806	78,271
Income tax expense	(21,026)	(19,463)	(24,899)	(26,285)
Net income	$ 25,619	$ 32,722	$ 46,907	$ 51,986
Basic earnings per common share	$ 0.34	$ 0.44	$ 0.63	$ 0.70
Diluted earnings per common share	$ 0.33	$ 0.42	$ 0.61	$ 0.68
Weighted-average number of common shares outstanding:
Basic	74,632	74,033	74,573	74,021
Diluted	77,379	77,043	77,283	76,927