Condensed Consolidated Balance Sheets - Unaudited (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 96,849	$ 133,747
Short-term investments	92,445	35,574
Total cash, cash equivalents and short-term investments	189,294	169,321
Trade accounts receivable:
Billed, net of allowance of $3,750 and $3,147	172,521	191,943
Unbilled and other	43,367	33,859
Deferred income taxes	16,116	22,244
Income taxes receivable	12,441	6,469
Other current assets	22,476	17,099
Total current assets	456,215	440,935
Non-current assets:
Property and equipment, net of depreciation of $129,990 and $120,643	35,173	39,429
Software, net of amortization of $73,941 and $68,513	39,036	36,729
Goodwill	227,546	233,365
Client contracts, net of amortization of $71,026 and $184,763	67,467	76,388
Deferred income taxes	3,312	2,596
Income taxes receivable	169	1,292
Other assets	15,508	16,207
Total non-current assets	388,211	406,006
Total assets	844,426	846,941
Current liabilities:
Current maturities of long-term debt	15,000	15,000
Client deposits	32,622	33,807
Trade accounts payable	35,623	30,473
Accrued employee compensation	44,536	61,083
Deferred revenue	56,195	47,691
Income taxes payable	2,282	2,116
Other current liabilities	22,428	21,562
Total current liabilities	208,686	211,732
Non-current liabilities:
Long-term debt, net of unamortized original issue discount of $22,678 and $25,302	254,822	259,698
Deferred revenue	8,192	6,504
Income taxes payable	1,168	1,168
Deferred income taxes	22,973	21,674
Other non-current liabilities	15,033	19,526
Total non-current liabilities	302,188	308,570
Total liabilities	510,874	520,302
Stockholders’ equity:
Preferred stock, par value $.01 per share; 10,000 shares authorized; zero shares issued and outstanding
Common stock, par value $.01 per share; 100,000 shares authorized; 33,797 and 33,734 shares outstanding	658	653
Additional paid-in capital	465,574	461,497
Treasury stock, at cost, 32,024 and 31,530 shares	(738,244)	(728,243)
Accumulated other comprehensive income (loss):
Unrealized gain on short-term investments, net of tax	(53)	3
Unrecognized pension plan losses and prior service costs, net of tax	(1,355)	(1,761)
Unrecognized loss on change in fair value of interest rate swaps, net of tax	(388)	(658)
Cumulative foreign currency translation adjustments	(7,415)	2,274
Accumulated earnings	614,775	592,874
Total stockholders’ equity	333,552	326,639
Total liabilities and stockholders’ equity	$ 844,426	$ 846,941