CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 100,165	$ 81,712
Short-term investments	99,605	120,088
Total cash, cash equivalents and short-term investments	199,770	201,800
Trade accounts receivable:
Billed, net of allowance of $3,878 and $3,323	177,347	184,369
Unbilled	46,795	42,439
Deferred income taxes	12,844	13,204
Income taxes receivable	6,107	7,851
Other current assets	31,148	28,470
Total current assets	474,011	478,133
Non-current assets:
Property and equipment, net of depreciation of $139,555 and $138,065	34,840	38,326
Intangible assets	80,443	91,635
Goodwill	222,086	225,269
Deferred income taxes	7,453	8,890
Income taxes receivable	1,179	1,333
Other assets	20,694	16,142
Total non-current assets	366,695	381,595
Total assets	840,706	859,728
Current liabilities:
Current maturities of long-term debt	7,500	22,500
Client deposits	33,394	35,791
Trade accounts payable	37,859	37,052
Accrued employee compensation	47,576	51,441
Deferred revenue	44,532	40,004
Income taxes payable	572	984
Other current liabilities	19,294	23,375
Total current liabilities	190,727	211,147
Non-current liabilities:
Long-term debt, net of unamortized original issue discount of $9,530 and $14,169	277,345	233,331
Deferred revenue	9,587	9,648
Income taxes payable	1,613	1,613
Deferred income taxes	14,591	20,445
Other non-current liabilities	12,935	15,821
Total non-current liabilities	316,071	280,858
Total liabilities	$ 506,798	$ 492,005
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; 32,692 and 33,945 shares outstanding	$ 670	$ 667
Common stock warrants; 2,851 and 2,851 warrants issued and outstanding	7,310	6,694
Additional paid-in capital	487,530	486,414
Treasury stock, at cost, 34,356 and 32,763 shares	(804,437)	(757,478)
Accumulated other comprehensive income (loss):
Unrealized gain on short-term investments, net of tax	6	6
Cumulative foreign currency translation adjustments	(23,753)	(13,386)
Accumulated earnings	666,582	644,806
Total stockholders' equity	333,908	367,723
Total liabilities and stockholders' equity	840,706	859,728
Software
Non-current assets:
Intangible assets	38,286	44,732
Client contracts
Non-current assets:
Intangible assets	$ 42,157	$ 46,903