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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

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