CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 86,122	$ 82,686
Short-term investments	103,461	128,151
Total cash, cash equivalents and short-term investments	189,583	210,837
Trade accounts receivable:
Billed, net of allowance of $2,798 and $2,359	191,615	178,511
Unbilled	39,592	38,365
Deferred income taxes	11,445	15,085
Income taxes receivable	7,640	3,815
Other current assets	35,105	28,762
Total current assets	474,980	475,375
Non-current assets:
Property and equipment, net of depreciation of $135,345 and $129,522	35,711	35,061
Software, net of amortization of $83,146 and $77,504	46,434	43,565
Goodwill	236,788	233,599
Client contracts, net of amortization of $85,759 and $75,382	49,436	55,191
Deferred income taxes	7,950	7,447
Income taxes receivable	1,833	1,930
Other assets	17,658	16,812
Total non-current assets	395,810	393,605
Total assets	870,790	868,980
Current liabilities:
Current maturities of long-term debt	18,750	15,000
Client deposits	32,445	30,431
Trade accounts payable	36,306	33,376
Accrued employee compensation	42,974	58,434
Deferred revenue	50,377	47,131
Income taxes payable	2,273	2,814
Other current liabilities	21,615	19,620
Total current liabilities	204,740	206,806
Non-current liabilities:
Long-term debt, net of unamortized original issue discount of $17,116 and $19,950	241,634	250,050
Deferred revenue	7,363	9,221
Income taxes payable	1,613	1,909
Deferred income taxes	17,653	20,274
Other non-current liabilities	14,957	14,616
Total non-current liabilities	283,220	296,070
Total liabilities	487,960	502,876
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; 34,092 and 33,745 shares outstanding	661	658
Additional paid-in capital	477,053	473,190
Treasury stock, at cost, 32,030 and 32,030 shares	(738,372)	(738,372)
Accumulated other comprehensive income (loss):
Unrealized gain on short-term investments, net of tax	51	41
Unrecognized loss on change in fair value of interest rate swap contracts, net of tax		(98)
Cumulative foreign currency translation adjustments	5,749	1,674
Accumulated earnings	637,688	629,011
Total stockholders' equity	382,830	366,104
Total liabilities and stockholders' equity	$ 870,790	$ 868,980