CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 135,117	$ 132,631
Short-term investments	151,615	108,305
Total cash, cash equivalents and short-term investments	286,732	240,936
Trade accounts receivable:
Billed, net of allowance of $3,726 and $3,600	178,914	178,854
Unbilled	34,518	41,110
Income taxes receivable	6,006	4,038
Other current assets	32,826	35,153
Total current assets	538,996	500,091
Non-current assets:
Property and equipment, net of depreciation of $118,446 and $112,282	32,748	35,992
Intangible assets	69,385	74,833
Goodwill	209,662	219,724
Deferred income taxes	12,025	17,462
Other assets	13,912	14,629
Total non-current assets	337,732	362,640
Total assets	876,728	862,731
Current liabilities:
Current portion of long-term debt, net of unamortized discounts of $1,469 and $8,632	53,603	148,868
Client deposits	32,991	33,694
Trade accounts payable	26,660	43,392
Accrued employee compensation	57,909	59,607
Deferred revenue	51,616	41,907
Income taxes payable	260	8,962
Other current liabilities	20,934	22,980
Total current liabilities	243,973	359,410
Non-current liabilities:
Long-term debt, net of unamortized discounts of $25,322 and $4,738	332,178	130,262
Deferred revenue	7,940	9,828
Income taxes payable	4,271	4,413
Deferred income taxes	50	182
Other non-current liabilities	13,143	12,791
Total non-current liabilities	357,582	157,476
Total liabilities	601,555	516,886
Current portion of long-term debt conversion obligation	33,894
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; 32,438 and 32,555 shares outstanding	673	672
Common stock warrants; 2,851 and 2,851 warrants issued and outstanding	7,310	7,310
Additional paid-in capital	396,133	503,254
Treasury stock, at cost, 34,865 and 34,601 shares	(823,963)	(814,437)
Accumulated other comprehensive income (loss):
Unrealized gain (loss) on short-term investments, net of tax	560	(97)
Cumulative foreign currency translation adjustments	(35,328)	(26,288)
Accumulated earnings	695,894	675,431
Total stockholders' equity	241,279	345,845
Total liabilities, current portion of long-term debt conversion obligation and stockholders' equity	876,728	862,731
Software
Non-current assets:
Intangible assets	31,805	35,095
Client contracts
Non-current assets:
Intangible assets	$ 37,580	$ 39,738