CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 201,080	$ 197,098
Billed receivables, net of allowances of $7,982 and $4,843, respectively	115,446	93,355
Accrued receivables	23,480	6,693
Deferred income taxes, net	39,940	25,944
Recoverable income taxes	5,706
Prepaid expenses	17,837	9,454
Other current assets	13,124	9,320
Total current assets	416,613	341,864
Property and equipment, net	45,714	20,479
Software, net	108,268	22,598
Goodwill	487,535	214,144
Other intangible assets, net	129,774	18,343
Deferred income taxes, net	8,186	13,466
Other noncurrent assets	32,586	33,748
TOTAL ASSETS	1,228,676	664,642
Current liabilities
Accounts payable	22,834	11,532
Accrued employee compensation	34,122	27,955
Current portion of Term Credit Facility	14,375
Deferred revenue	177,801	132,995
Income taxes payable	270	10,427
Alliance agreement liability	20,667	20,667
Accrued and other current liabilities	28,762	23,481
Total current liabilities	298,831	227,057
Noncurrent liabilities
Deferred revenue	29,487	32,721
Other noncurrent liabilities	18,683	12,534
Total liabilities	699,501	347,312
Commitments and contingencies (Note 15)
Stockholders' equity
Preferred stock, $0.01 par value; 5,000,000 shares authorized; no shares issued and outstanding at March 31, 2012 and December 31, 2011
Common stock, $0.005 par value; 70,000,000 shares authorized; 46,606,796 and 40,821,516 shares issued at March 31, 2012 and December 31, 2011, respectively	232	204
Common stock warrants	24,003	24,003
Treasury stock, at cost, 6,834,010 and 7,178,427 shares outstanding at March 31, 2012 and December 31, 2011, respectively	(158,796)	(163,411)
Additional paid-in capital	528,838	322,654
Retained earnings	149,319	151,141
Accumulated other comprehensive loss	(14,421)	(17,261)
Total stockholders' equity	529,175	317,330
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,228,676	664,642
Term Credit Facility
Noncurrent liabilities
Note payable under credit facility	182,500
Revolving Credit Facility
Noncurrent liabilities
Note payable under credit facility	$ 170,000	$ 75,000