Condensed Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Assets
Cash and cash equivalents	$ 172,577	$ 163,779	$ 119,956
Short-term investments	146,799	149,160	142,483
Restricted cash	413	255	108
Accounts receivable, net	56,140	68,937	85,246
Deferred income taxes	6,760	9,079	17,488
Prepaid expenses and other current assets	19,565	22,887	17,494
Total current assets	402,254	414,097	382,775
Property and equipment, net	201,010	198,213	197,383
Deferred income taxes	37,068	21,814	18,189
Other assets	46,422	40,656	29,383
Total assets	686,754	674,780	627,730
Liabilities and Shareholders' Equity
Accounts payable	88,825	67,920	79,620
Accrued compensation and benefits	16,772	28,428	19,545
Other current liabilities	12,809	15,441	12,051
Deferred revenue	226,046	244,362	195,168
Total current liabilities	344,452	356,151	306,384
Long-term debt	150,000	150,000	150,000
Other liabilities	63,840	40,559	29,004
Total liabilities	558,292	546,710	485,388
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, 37,068,904 and 54,068,904 issued	371	371	541
Capital surplus	186,009	173,935	170,699
Retained earnings	751,705	524,678	1,270,248
Accumulated other comprehensive (loss)	(4,498)	(4,509)	(9,147)
Treasury stock, 10,405,882, 7,075,563 and 22,151,915 shares, at cost	(805,125)	(566,405)	(1,289,999)
Total shareholders' equity	128,462	128,070	142,342
Total liabilities and shareholders' equity	$ 686,754	$ 674,780	$ 627,730