CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 112,484	$ 76,329
Billed receivables, net of allowances of $8,834 and $8,117, respectively	168,145	176,313
Accrued receivables	31,844	41,008
Deferred income taxes, net	69,347	34,342
Recoverable income taxes	4,120	5,572
Prepaid expenses	20,939	16,746
Other current assets	15,147	5,816
Total current assets	422,026	356,126
Property and equipment, net	49,342	41,286
Software, net	189,810	129,314
Goodwill	603,669	501,141
Other intangible assets, net	232,114	127,900
Deferred income taxes, net	20,120	63,370
Other noncurrent assets	40,235	31,749
TOTAL ASSETS	1,557,316	1,250,886
Current liabilities
Accounts payable	40,003	33,926
Accrued employee compensation	33,342	35,194
Current portion of term credit facility	50,000	17,500
Deferred revenue	148,909	139,863
Income taxes payable	4,732	3,542
Deferred income taxes, net	330	174
Accrued and other current liabilities	34,211	36,400
Total current liabilities	311,527	266,599
Noncurrent liabilities
Deferred revenue	56,456	51,519
Note payable under term credit facility	432,500	168,750
Note payable under revolving credit facility	188,000	188,000
Deferred income taxes, net	13,854	14,940
Other noncurrent liabilities	29,253	26,721
Total liabilities	1,031,590	716,529
Commitments and contingencies (Note 14)
Stockholders' equity
Preferred stock; $0.01 par value; 5,000,000 shares authorized; no shares issued and outstanding at March 31, 2013 and December 31, 2012
Common stock; $0.005 par value; 70,000,000 shares authorized; 46,606,796 shares issued at March 31, 2013 and December 31, 2012	232	232
Treasury stock, at cost, 6,769,149 and 7,159,023 shares at March 31, 2013 and December 31, 2012, respectively	(179,088)	(186,784)
Additional paid-in capital	531,248	534,953
Retained earnings	197,821	199,987
Accumulated other comprehensive loss	(24,487)	(14,031)
Total stockholders' equity	525,726	534,357
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,557,316	$ 1,250,886