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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Trade accounts receivable-billed, allowance |  | $ 5,432 | $ 5,528
Property and equipment, accumulated depreciation |  | 121,816 | 105,466
Customer contract costs, accumulated amortization |  | 42,094 | 30,601
Long-term debt, unamortized discounts |  | $ 15,628 | $ 2,656
Preferred stock, par value |  | $ 0.01 | $ 0.01
Preferred stock, shares authorized |  | 10,000,000 | 10,000,000
Preferred stock, shares issued |  | 0 | 0
Preferred stock, shares outstanding |  | 0 | 0
Common stock, par value |  | $ 0.01 | $ 0.01
Common stock, shares authorized |  | 100,000,000 | 100,000,000
Common stock, shares reserved for employee stock purchase plan and stock incentive plans |  | 6,781,000 | 5,091,000
Common stock, shares outstanding |  | 29,541,000 | 31,269,000
Treasury stock, shares |  | 40,398 | 38,210
Software |  |  |
Intangibles, accumulated amortization |  | $ 157,601 | $ 150,337
Acquired customer contracts |  |  |
Intangibles, accumulated amortization | [1] | $ 126,469 | $ 120,080
[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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