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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Current assets: |  |  |
Cash and cash equivalents |  | $ 150,365 | $ 205,635
Short-term investments |  | 71 | 28,037
Total cash, cash equivalents and short-term investments |  | 150,436 | 233,672
Settlement and merchant reserve assets |  | 238,653 | 186,267
Trade accounts receivable: |  |  |
Billed, net of allowance of $5,528 and $4,250 |  | 274,189 | 244,317
Unbilled |  | 52,830 | 35,802
Income taxes receivable |  | 1,270 | 6,414
Other current assets |  | 48,577 | 41,727
Total current assets |  | 765,955 | 748,199
Non-current assets: |  |  |
Property and equipment, net of depreciation of $105,466 and $111,244 |  | 71,787 | 73,580
Operating lease right-of-use assets |  | 49,687 | 86,034
Goodwill |  | 304,036 | 321,330
Customer contract costs, net of amortization of $30,601 and $32,410 |  | 54,735 | 46,618
Deferred income taxes |  | 26,206 | 8,584
Other assets |  | 7,956 | 15,840
Total non-current assets |  | 582,598 | 638,950
Total assets |  | 1,348,553 | 1,387,149
Current liabilities: |  |  |
Current portion of long-term debt |  | 37,500 | 237,500
Operating lease liabilities |  | 21,012 | 23,270
Customer deposits |  | 40,472 | 43,546
Trade accounts payable |  | 47,720 | 35,397
Accrued employee compensation |  | 68,321 | 91,115
Settlement and merchant reserve liabilities |  | 237,810 | 185,276
Deferred revenue |  | 46,033 | 53,748
Income taxes payable |  | 5,455 | 398
Other current liabilities |  | 22,886 | 24,852
Total current liabilities |  | 527,209 | 695,102
Non-current liabilities: |  |  |
Long-term debt, net of unamortized discounts of $2,656 and $3,406 |  | 375,469 | 137,219
Operating lease liabilities |  | 53,207 | 70,068
Deferred revenue |  | 21,991 | 19,599
Income taxes payable |  | 3,410 | 4,058
Deferred income taxes |  | 117 | 7,752
Other non-current liabilities |  | 11,901 | 13,107
Total non-current liabilities |  | 466,095 | 251,803
Total liabilities |  | 993,304 | 946,905
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; 5,091 and 4,704 shares reserved for employee stock purchase plan and stock incentive plans; 31,269 and 32,495 shares outstanding |  | 708 | 705
Additional paid-in capital |  | 495,189 | 488,303
Treasury stock, at cost; 38,210 and 36,713 shares |  | (1,018,034) | (930,106)
Accumulated other comprehensive income (loss): |  |  |
Unrealized gain (loss) on short-term investments, net of tax |  | 1 | (6)
Cumulative foreign currency translation adjustments |  | (58,830) | (38,347)
Accumulated earnings |  | 936,215 | 916,060
Total CSG stockholders' equity |  | 355,249 | 436,609
Noncontrolling interest |  |  | 3,635
Total stockholders' equity |  | 355,249 | 440,244
Total liabilities and stockholders' equity |  | 1,348,553 | 1,387,149
Software |  |  |
Non-current assets: |  |  |
Intangible assets |  | 22,774 | 29,757
Acquired customer contracts |  |  |
Non-current assets: |  |  |
Intangible assets | [1] | $ 45,417 | $ 57,207
[1] | Acquired customer contracts represent assets acquired in our prior business acquisitions. Acquired customer contracts are amortized over their estimated useful lives ranging from one 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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