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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Current assets: |  |  |
Cash and cash equivalents |  | $ 186,264 | $ 150,365
Short-term investments |  | 0 | 71
Total cash, cash equivalents and short-term investments |  | 186,264 | 150,436
Settlement and merchant reserve assets |  | 274,699 | 238,653
Trade accounts receivable: |  |  |
Billed, net of allowance of $5,432 and $5,528 |  | 267,680 | 274,189
Unbilled |  | 82,163 | 52,830
Income taxes receivable |  | 1,345 | 1,270
Other current assets |  | 50,075 | 48,577
Total current assets |  | 862,226 | 765,955
Non-current assets: |  |  |
Property and equipment, net of depreciation of $121,816 and $105,466 |  | 65,545 | 71,787
Operating lease right-of-use assets |  | 34,283 | 49,687
Goodwill |  | 308,596 | 304,036
Customer contract costs, net of amortization of $42,094 and $30,601 |  | 54,421 | 54,735
Deferred income taxes |  | 57,855 | 26,206
Other assets |  | 10,017 | 7,956
Total non-current assets |  | 580,820 | 582,598
Total assets |  | 1,443,046 | 1,348,553
Current liabilities: |  |  |
Current portion of long-term debt |  | 7,500 | 37,500
Operating lease liabilities |  | 15,946 | 21,012
Customer deposits |  | 41,035 | 40,472
Trade accounts payable |  | 46,406 | 47,720
Accrued employee compensation |  | 84,380 | 68,321
Settlement and merchant reserve liabilities |  | 273,817 | 237,810
Deferred revenue |  | 54,199 | 46,033
Income taxes payable |  | 4,104 | 5,455
Other current liabilities |  | 33,449 | 22,886
Total current liabilities |  | 560,836 | 527,209
Non-current liabilities: |  |  |
Long-term debt, net of unamortized discounts of $15,628 and $2,656 |  | 534,997 | 375,469
Operating lease liabilities |  | 34,360 | 53,207
Deferred revenue |  | 23,447 | 21,991
Income taxes payable |  | 3,041 | 3,410
Deferred income taxes |  | 123 | 117
Other non-current liabilities |  | 12,916 | 11,901
Total non-current liabilities |  | 608,884 | 466,095
Total liabilities |  | 1,169,720 | 993,304
Stockholders' equity: |  |  |
Preferred stock, par value $.01 per share; 10,000 shares authorized; zero shares issued and outstanding |  | 0 | 0
Common stock, par value $.01 per share; 100,000 shares authorized; 6,781 and 5,091 shares reserved for employee stock purchase plan and stock incentive plans; 29,541 and 31,269 shares outstanding |  | 713 | 708
Additional paid-in capital |  | 490,947 | 495,189
Treasury stock, at cost; 40,398 and 38,210 shares |  | (1,136,055) | (1,018,034)
Accumulated other comprehensive income (loss): |  |  |
Unrealized gain on short-term investments, net of tax |  | 1 | 1
Cumulative foreign currency translation adjustments |  | (50,414) | (58,830)
Accumulated earnings |  | 968,134 | 936,215
Total stockholders' equity |  | 273,326 | 355,249
Total liabilities and stockholders' equity |  | 1,443,046 | 1,348,553
Software |  |  |
Non-current assets: |  |  |
Intangible assets |  | 14,224 | 22,774
Acquired customer contracts |  |  |
Non-current assets: |  |  |
Intangible assets | [1] | $ 35,879 | $ 45,417
[1] | Acquired customer contracts represent assets acquired in our prior business acquisitions. Acquired customer contracts are amortized over their estimated useful lives ranging from three to twenty years based on the approximate pattern in which the economic benefits of the intangible assets are expected to be realized, with the amortization expense included as cost of revenue in our Income Statements.

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