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CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance (in shares) |  | 133,045,000 |  |
Beginning balance |  | $ 1,401,459 | $ 1,308,547 | $ 1,291,704
Net increase (decrease) in net assets resulting from operations |  | $ 337,484 | $ 102,081 | $ 174,155
Public offering, net of offering expenses (in shares) |  | 22,700,000 | 14,600,000 | 600,000
Public offering, net of offering expenses |  | $ 338,215 | $ 229,659 | $ 10,620
Issuance of common stock under equity-based award plans |  | 495 | 1,484 | 3,903
Shares retired on vesting of equity-based awards |  | $ (13,197) | $ (6,016) | $ (6,719)
Distributions reinvested in common stock (in shares) |  | 303,960 | 259,466 | 248,041
Distributions reinvested in common stock |  | $ 4,624 | $ 3,953 | $ 4,074
Distributions |  | (278,301) | (249,077) | (179,575)
Stock-based compensation | [1] | $ 11,927 | $ 10,828 | 10,385
Ending balance (in shares) |  | 157,758,000 | 133,045,000 |
Ending balance |  | $ 1,802,706 | $ 1,401,459 | $ 1,308,547
Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance (in shares) |  | 133,044,602 | 116,619,000 | 114,726,000
Beginning balance |  | $ 134 | $ 117 | $ 115
Public offering, net of offering expenses (in shares) |  | 22,728,000 | 14,559,000 | 639,000
Public offering, net of offering expenses |  | $ 22 | $ 15 | $ 1
Issuance of common stock under equity-based award plans (in shares) |  | 1,932,000 | 922,000 | 1,311,000
Issuance of common stock under equity-based award plans |  | $ 2 | $ 1 | $ 1
Shares retired on vesting of equity-based awards (in shares) |  | (251,000) | (295,000) | (305,000)
Distributions reinvested in common stock (in shares) |  | 304,000 | 259,000 | 248,000
Issuance of Convertible Notes (in shares) |  |  | 981,000 |
Issuance of Convertible Notes |  |  | $ 1 |
Distributions |  | $ (275,548) | $ (246,873) | $ (177,864)
Ending balance (in shares) |  | 157,758,072 | 133,044,602 | 116,619,000
Ending balance |  | $ 158 | $ 134 | $ 117
Capital in Excess of Par Value |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  | 1,341,416 | 1,091,907 | 1,158,198
Public offering, net of offering expenses |  | 338,193 | 229,644 | 10,619
Issuance of common stock under equity-based award plans |  | 493 | 1,483 | 3,902
Shares retired on vesting of equity-based awards |  | (13,197) | (6,016) | (6,719)
Distributions reinvested in common stock |  | 4,624 | 3,953 | 4,074
Issuance of Convertible Notes |  |  | (1) |
Stock-based compensation | [1] | 11,927 | 10,828 | 10,385
Tax reclassification of stockholders' equity in accordance with generally accepted accounting principles |  | (20,921) | 9,618 | (88,552)
Ending balance |  | 1,662,535 | 1,341,416 | 1,091,907
Distributable Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  | 59,909 | 216,523 | 133,391
Net increase (decrease) in net assets resulting from operations |  | 337,484 | 102,081 | 174,155
Distributions |  | (278,301) | (249,077) | (179,575)
Tax reclassification of stockholders' equity in accordance with generally accepted accounting principles |  | 20,921 | (9,618) | 88,552
Ending balance |  | $ 140,013 | $ 59,909 | $ 216,523
[1] | Stock-based compensation includes $117 thousand, $149 thousand, and $125 thousand of restricted stock and option expense related to director compensation for the years ended December 31, 2023, 2022 and 2021, respectively.

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