CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Current assets:
Cash and cash equivalents	$ 174,458	$ 228,993	$ 172,577
Short-term investments	0	148,488	146,799
Restricted cash	720	2,128	413
Accounts receivable, net	89,425	48,106	56,140
Deferred income taxes	19,284	9,759	6,760
Prepaid expenses and other current assets	18,331	18,814	19,565
Total current assets	302,218	456,288	402,254
Property and equipment, net	194,253	201,257	201,010
Deferred income taxes	39,499	33,267	37,068
Other assets	49,080	38,006	46,422
Total assets	585,050	728,818	686,754
Current liabilities:
Accounts payable	76,358	78,876	88,825
Accrued compensation and benefits	19,729	21,438	16,772
Other current liabilities	19,910	18,190	12,809
Deferred revenue	119,089	226,543	226,046
Total current liabilities	235,086	345,047	344,452
Long-term debt	140,000	150,000	150,000
Other liabilities	78,189	64,972	63,840
Total liabilities	453,275	560,019	558,292
Shareholders' equity:
Preferred stock, $.01 par value, 5,000,000 shares authorized, none issued	0	0	0
Common stock, $.01 par value, 300,000,000 shares authorized, 37,068,904 issued	371	371	371
Capital surplus	203,095	189,573	186,009
Retained earnings	968,545	827,675	751,705
Accumulated other comprehensive (loss)	(8,970)	(9,479)	(4,498)
Treasury stock, 13,744,474, 10,969,425 and 10,405,882 shares, at cost	(1,031,266)	(839,341)	(805,125)
Total shareholders' equity	131,775	168,799	128,462
Total liabilities and shareholders' equity	$ 585,050	$ 728,818	$ 686,754