Condensed Consolidated Balance Sheets - Unaudited (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 92,736	$ 133,747
Short-term investments	101,162	35,574
Total cash, cash equivalents and short-term investments	193,898	169,321
Trade accounts receivable:
Billed, net of allowance of $3,043 and $3,147	174,757	191,943
Unbilled	41,347	28,463
Deferred income taxes	14,095	22,244
Income taxes receivable	5,903	6,469
Other current assets	27,891	21,915
Total current assets	457,891	440,355
Non-current assets:
Property and equipment, net of depreciation of $132,020 and $120,643	34,674	39,429
Software, net of amortization of $77,106 and $68,496	41,099	38,372
Goodwill	231,235	233,365
Client contracts, net of amortization of $74,137 and $182,182	61,187	75,303
Deferred income taxes	5,475	2,596
Income taxes receivable	2,299	1,291
Other assets	16,004	16,230
Total non-current assets	391,973	406,586
Total assets	849,864	846,941
Current liabilities:
Current maturities of long-term debt	15,000	15,000
Client deposits	30,239	33,807
Trade accounts payable	33,211	30,473
Accrued employee compensation	48,622	61,083
Deferred revenue	50,961	47,691
Income taxes payable	2,360	2,116
Other current liabilities	17,193	21,562
Total current liabilities	197,586	211,732
Non-current liabilities:
Long-term debt, net of unamortized original issue discount of $21,327 and $25,302	252,423	259,698
Deferred revenue	9,750	6,504
Income taxes payable	2,068	1,168
Deferred income taxes	18,364	21,674
Other non-current liabilities	15,126	19,526
Total non-current liabilities	297,731	308,570
Total liabilities	495,317	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; 33,839 and 33,734 shares outstanding	659	653
Additional paid-in capital	469,878	461,497
Treasury stock, at cost, 32,030 and 31,530 shares	(738,372)	(728,243)
Accumulated other comprehensive income (loss):
Unrealized gain on short-term investments, net of tax	28	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	(235)	(658)
Cumulative foreign currency translation adjustments	(1,056)	2,274
Accumulated earnings	625,000	592,874
Total stockholders’ equity	354,547	326,639
Total liabilities and stockholders’ equity	$ 849,864	$ 846,941