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CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 140,221 | $ 132,631
Short-term investments | 125,917 | 108,305
Total cash, cash equivalents and short-term investments | 266,138 | 240,936
Trade accounts receivable: |  |
Billed, net of allowance of $2,906 and $3,600 | 201,610 | 178,854
Unbilled | 33,934 | 41,110
Income taxes receivable | 4,012 | 4,038
Other current assets | 33,320 | 35,153
Total current assets | 539,014 | 500,091
Non-current assets: |  |
Property and equipment, net of depreciation of $120,813 and $112,282 | 30,618 | 35,992
Intangible assets | 66,060 | 74,833
Goodwill | 206,887 | 219,724
Deferred income taxes | 14,239 | 17,462
Other assets | 11,300 | 14,629
Total non-current assets | 329,104 | 362,640
Total assets | 868,118 | 862,731
Current liabilities: |  |
Current portion of long-term debt, net of unamortized discounts of $734 and $8,632 | 47,123 | 148,868
Client deposits | 32,746 | 33,694
Trade accounts payable | 25,348 | 43,392
Accrued employee compensation | 58,941 | 59,607
Deferred revenue | 48,959 | 41,907
Income taxes payable | 2,234 | 8,962
Other current liabilities | 17,260 | 22,980
Total current liabilities | 232,611 | 359,410
Non-current liabilities: |  |
Long-term debt, net of unamortized discounts of $24,169 and $4,738 | 329,581 | 130,262
Deferred revenue | 7,726 | 9,828
Income taxes payable | 4,392 | 4,413
Deferred income taxes | 19 | 182
Other non-current liabilities | 12,828 | 12,791
Total non-current liabilities | 354,546 | 157,476
Total liabilities | 587,157 | 516,886
Current portion of long-term debt conversion obligation | 28,690 |
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; 32,317 and 32,555 shares outstanding | 672 | 672
Common stock warrants; 2,851 and 2,851 warrants issued and outstanding | 7,310 | 7,310
Additional paid-in capital | 397,029 | 503,254
Treasury stock, at cost, 34,865 and 34,601 shares | (823,963) | (814,437)
Accumulated other comprehensive income (loss): |  |
Unrealized loss on short-term investments, net of tax | (6) | (97)
Cumulative foreign currency translation adjustments | (36,721) | (26,288)
Accumulated earnings | 707,950 | 675,431
Total stockholders' equity | 252,271 | 345,845
Total liabilities, current portion of long-term debt conversion obligation and stockholders' equity | 868,118 | 862,731
Software |  |
Non-current assets: |  |
Intangible assets | 30,365 | 35,095
Client contracts |  |
Non-current assets: |  |
Intangible assets | $ 35,695 | $ 39,738

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