Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 136,473	$ 146,733
Short-term investments	32,848	12,097
Total cash, cash equivalents and short-term investments	169,321	158,830
Trade accounts receivable:
Billed, net of allowance of $3,147 and $2,421	191,943	179,804
Unbilled and other	33,859	30,981
Deferred income taxes	22,244	19,982
Income taxes receivable	6,469	4,139
Other current assets	17,099	16,224
Total current assets	440,935	409,960
Non-current assets:
Property and equipment, net of depreciation of $120,643 and $116,125	39,429	41,154
Software, net of amortization of $68,513 and $56,521	36,729	29,966
Goodwill	233,365	220,013
Client contracts, net of amortization of $184,763 and $159,225	76,388	98,403
Deferred income taxes	2,596	1,008
Income taxes receivable	1,292
Other assets	16,207	14,393
Total non-current assets	406,006	404,937
Total assets	846,941	814,897
Current liabilities:
Current maturities of long-term debt	15,000	27,000
Client deposits	33,807	30,523
Trade accounts payable	30,473	27,198
Accrued employee compensation	61,083	42,005
Deferred revenue	47,691	44,824
Income taxes payable	2,116	2,334
Other current liabilities	21,562	23,501
Total current liabilities	211,732	197,385
Non-current liabilities:
Long-term debt, net of unamortized original issue discount of $25,302 and $30,256	259,698	282,744
Deferred revenue	6,504	8,631
Income taxes payable	1,168	4,114
Deferred income taxes	21,674	28,188
Other non-current liabilities	19,526	19,121
Total non-current liabilities	308,570	342,798
Total liabilities	520,302	540,183
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; 6,904 and 8,676 shares reserved for employee stock purchase plan and stock incentive plans; 33,734 and 33,822 shares outstanding	653	645
Additional paid-in capital	461,497	449,376
Treasury stock, at cost, 31,530 and 30,707 shares	(728,243)	(714,893)
Accumulated other comprehensive income (loss):
Unrealized gain on short-term investments, net of tax	3	1
Unrecognized pension plan losses and prior service costs, net of tax	(1,761)	(1,794)
Unrecognized loss on change in fair value of interest rate swap contracts, net of tax	(658)	(618)
Cumulative foreign currency translation adjustments	2,274	(1,998)
Accumulated earnings	592,874	543,995
Total stockholders' equity	326,639	274,714
Total liabilities and stockholders' equity	$ 846,941	$ 814,897