Annual report pursuant to Section 13 and 15(d)

DIVIDENDS, DISTRIBUTIONS AND TAXABLE INCOME - Narrative (Details)

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DIVIDENDS, DISTRIBUTIONS AND TAXABLE INCOME - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]                  
Monthly dividend, per share (in dollars per share)         $ 0.22   $ 0.215    
Monthly dividend               $ 192,300 $ 170,200
Dividends, per share (in dollars per share)               $ 2.595 $ 2.475
Monthly dividend, increase (decrease)               4.80%  
Supplemental dividend $ 7,800 $ 7,600 $ 5,500 $ 5,400   $ 7,100   $ 26,400  
Supplemental dividend, per share (in dollars per share) $ 0.10 $ 0.10 $ 0.075 $ 0.075   $ 0.10   $ 0.35  
Monthly and supplemental dividend               $ 218,700 $ 177,300
Monthly and supplemental dividend, per share (in dollars per share)               $ 2.945 $ 2.575
Monthly and supplemental dividend, increase (decrease)               23.40%  
Ordinary income (in dollars per share)               $ 2.629  
Qualified on dividend income (in dollars per share)               $ 0.317  
Undistributed taxable income $ 66,900       $ 66,900     $ 66,900  
Undistributed taxable income (in dollars per share)               $ 0.87  
Investments, cost for U.S. federal income tax 3,754,500       3,754,500     $ 3,754,500  
Investments, gross unrealized appreciation 701,000       701,000     701,000  
Investments, gross unrealized depreciation 353,300       353,300     353,300  
Net deferred tax liabilities 47,849       47,849 $ 29,723   47,849 $ 29,723
Tax credit carryforward $ 56,100       $ 56,100     $ 56,100