CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 142,751	$ 126,351
Short-term investments	115,796	150,147
Total cash, cash equivalents and short-term investments	258,547	276,498
Trade accounts receivable:
Billed, net of allowance of $2,456 and $3,080	201,837	208,930
Unbilled	34,688	30,828
Income taxes receivable	9,560	11,931
Other current assets	35,034	31,751
Total current assets	539,666	559,938
Non-current assets:
Property and equipment, net of depreciation of $128,669 and $122,866	37,822	33,116
Intangible assets	63,811	71,102
Goodwill	210,023	201,094
Deferred income taxes	14,251	14,218
Other assets	9,799	12,411
Total non-current assets	335,706	331,941
Total assets	875,372	891,879
Current liabilities:
Current portion of long-term debt, net of unamortized discounts of zero and $296	20,625	49,426
Client deposits	29,061	33,916
Trade accounts payable	31,686	35,118
Accrued employee compensation	60,346	65,341
Deferred revenue	53,597	45,064
Income taxes payable	613	822
Other current liabilities	15,168	22,342
Total current liabilities	211,096	252,029
Non-current liabilities:
Long-term debt, net of unamortized discounts of $19,462 and $23,007	313,663	326,993
Deferred revenue	11,550	6,694
Income taxes payable	2,445	2,245
Deferred income taxes	98	99
Other non-current liabilities	11,668	12,618
Total non-current liabilities	339,424	348,649
Total liabilities	550,520	600,678
Current portion of long-term debt conversion obligation		39,841
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; 33,575 and 32,261 shares outstanding	689	672
Common stock warrants; zero and 1,426 warrants vested; 1,425 and 2,851 issued		16,007
Additional paid-in capital	422,919	391,209
Treasury stock, at cost; 33,959 and 34,919 shares	(809,748)	(826,002)
Accumulated other comprehensive income (loss):
Unrealized loss on short-term investments, net of tax	(5)	(159)
Cumulative foreign currency translation adjustments	(30,040)	(45,213)
Accumulated earnings	741,037	714,846
Total stockholders' equity	324,852	251,360
Total liabilities, current portion of long-term debt conversion obligation and stockholders' equity	875,372	891,879
Software
Non-current assets:
Intangible assets	27,014	30,427
Client contracts
Non-current assets:
Intangible assets	$ 36,797	$ 40,675