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UNSECURED DEBT (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) basisPoints | Dec. 31, 2022 USD ($) basisPoints | Dec. 31, 2021 USD ($)
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 1,680,000 |  | $ 1,695,000 |
Unsecured debt, net of debt issuance costs |  | $ 1,676,347 |  | $ 1,691,259 |
Weighted average interest rates (in hundredths) |  | 5.68% |  | 2.32% | 1.01%
Proceeds from unsecured debt |  | $ 100,000 |  | $ 525,000 | $ 175,000
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | 1,680,000 |  | 1,695,000 |
Unsecured Debt [Member] |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross | [1] | 1,680,000 |  | 1,695,000 |
Unamortized debt issuance costs |  | 3,653 |  | 3,741 |
Unsecured debt, net of debt issuance costs |  | 1,676,347 |  | 1,691,259 |
Payments of principal over future years [Abstract] |  |  |  |  |
2024 |  | 170,000 |  |  |
2025 |  | 145,000 |  |  |
2026 |  | 140,000 |  |  |
2027 |  | 175,000 |  |  |
2028 |  | 160,000 |  |  |
Thereafter |  | 890,000 |  |  |
Long-Term Debt, Gross | [1] | 1,680,000 |  | 1,695,000 |
$65 million term loan (2016) [Member] |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross | [2] | $ 0 |  | 65,000 |
Debt instrument, margin | [2] | 1.10% |  |  |
Effective interest rate | [2] | 2.31% |  |  |
Debt Instrument, Maturity Date | [2] | Apr. 01, 2023 |  |  |
Unsecured debt, carrying amount repaid |  | $ 65,000 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross | [2] | 0 |  | 65,000 |
Fifty million senior unsecured notes [Member] |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 0 |  | 50,000 |
Effective interest rate |  | 3.80% |  |  |
Debt Instrument, Maturity Date |  | Aug. 28, 2023 |  |  |
Unsecured debt, carrying amount repaid |  | $ 50,000 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | 0 |  | 50,000 |
$50 million term loan (2022) |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross | [3] | $ 50,000 |  | 50,000 |
Debt instrument, margin | [3] | 0.95% |  |  |
Effective interest rate | [3] | 4.09% |  |  |
Debt Instrument, Maturity Date | [3] | Aug. 30, 2024 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross | [3] | $ 50,000 |  | 50,000 |
Sixty million senior unsecured notes (executed in 2017) [Member] |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 60,000 |  | 60,000 |
Effective interest rate |  | 3.46% |  |  |
Debt Instrument, Maturity Date |  | Dec. 13, 2024 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 60,000 |  | 60,000 |
Sixty million senior unsecured notes (executed in 2016) [Member] |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 60,000 |  | 60,000 |
Effective interest rate |  | 3.48% |  |  |
Debt Instrument, Maturity Date |  | Dec. 15, 2024 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 60,000 |  | 60,000 |
$50 million unsecured term loan (2021) |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross | [3] | $ 50,000 |  | 50,000 |
Debt instrument, margin | [3] | 1.10% |  |  |
Effective interest rate | [3] | 1.58% |  |  |
Debt Instrument, Maturity Date | [3] | Mar. 18, 2025 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross | [3] | $ 50,000 |  | 50,000 |
Twenty million senior unsecured notes [Member] |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 20,000 |  | 20,000 |
Effective interest rate |  | 3.80% |  |  |
Debt Instrument, Maturity Date |  | Aug. 28, 2025 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 20,000 |  | 20,000 |
Twenty-five million senior unsecured notes (executed in 2015) [Member] |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 25,000 |  | 25,000 |
Effective interest rate |  | 3.97% |  |  |
Debt Instrument, Maturity Date |  | Oct. 01, 2025 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 25,000 |  | 25,000 |
Fifty million senior unsecured notes (executed in 2015) [Member] |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 50,000 |  | 50,000 |
Effective interest rate |  | 3.99% |  |  |
Debt Instrument, Maturity Date |  | Oct. 07, 2025 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 50,000 |  | 50,000 |
$100 million term loan (2019) - refinanced in 2021 [Member] |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross | [3] | $ 100,000 |  | 100,000 |
Debt instrument, margin | [3] | 0.95% |  |  |
Effective interest rate | [3] | 2.10% |  |  |
Debt Instrument, Maturity Date | [3] | Oct. 10, 2026 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross | [3] | $ 100,000 |  | 100,000 |
Forty million senior unsecured notes (executed in 2016) [Member] |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 40,000 |  | 40,000 |
Effective interest rate |  | 3.75% |  |  |
Debt Instrument, Maturity Date |  | Dec. 15, 2026 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 40,000 |  | 40,000 |
$100 million term loan (2020) |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross | [3],[4] | $ 100,000 |  | $ 100,000 |
Debt instrument, margin | [3],[4] | 0.95% |  |  |
Effective interest rate |  | 1.80% | [3],[4] | 2.39% |
Debt Instrument, Maturity Date | [3],[4] | Mar. 25, 2027 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross | [3],[4] | $ 100,000 |  | $ 100,000 |
$ 75 million term loan (2022) |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross | [3] | $ 75,000 |  | 75,000 |
Debt instrument, margin | [3] | 0.95% |  |  |
Effective interest rate | [3] | 4.00% |  |  |
Debt Instrument, Maturity Date | [3] | Aug. 31, 2027 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross | [3] | $ 75,000 |  | 75,000 |
Sixty million senior unsecured notes (executed in 2018) [Member] |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 60,000 |  | 60,000 |
Effective interest rate |  | 3.93% |  |  |
Debt Instrument, Maturity Date |  | Apr. 10, 2028 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 60,000 |  | 60,000 |
$100 million senior unsecured term loan (new in 2022; refinanced in 2023) |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross | [3],[5] | $ 100,000 |  | $ 100,000 |
Debt instrument, margin | [3],[5] | 0.95% |  |  |
Effective interest rate |  | 2.61% | [3],[5] | 3.06% |
Debt Instrument, Maturity Date | [3],[5] | Sep. 29, 2028 |  |  |
Basis point reduction in credit spread | basisPoints |  | 45 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross | [3],[5] | $ 100,000 |  | $ 100,000 |
Long-term Debt, Term |  | 5 years |  |  |
$80 million senior unsecured private placement notes (2019) [Member] |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 80,000 |  | 80,000 |
Effective interest rate |  | 4.27% |  |  |
Debt Instrument, Maturity Date |  | Mar. 28, 2029 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 80,000 |  | 80,000 |
$75 million senior unsecured private placement notes (2019) [Member] |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 75,000 |  | 75,000 |
Effective interest rate |  | 3.47% |  |  |
Debt Instrument, Maturity Date |  | Aug. 19, 2029 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 75,000 |  | 75,000 |
$100 million term loan (new in 2023) |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross | [3] | $ 100,000 |  | 0 |
Debt instrument, margin | [3] | 1.35% |  |  |
Effective interest rate | [3] | 5.27% |  |  |
Debt Instrument, Maturity Date | [3] | Jan. 13, 2030 |  |  |
Debt Instrument, Term |  | 7 years |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross | [3] | $ 100,000 |  | 0 |
$100 million senior unsecured private placement notes (2020) |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 100,000 |  | 100,000 |
Effective interest rate |  | 2.61% |  |  |
Debt Instrument, Maturity Date |  | Oct. 14, 2030 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 100,000 |  | 100,000 |
$125 million senior unsecured private placement notes (2021) |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 125,000 |  | 125,000 |
Effective interest rate |  | 2.74% |  |  |
Debt Instrument, Maturity Date |  | Jun. 10, 2031 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 125,000 |  | 125,000 |
$35 million senior unsecured private placement notes (2019) [Member] |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 35,000 |  | 35,000 |
Effective interest rate |  | 3.54% |  |  |
Debt Instrument, Maturity Date |  | Aug. 15, 2031 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 35,000 |  | 35,000 |
$150 million senior note (2022) |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 150,000 |  | 150,000 |
Effective interest rate |  | 3.03% |  |  |
Debt Instrument, Maturity Date |  | Apr. 20, 2032 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 150,000 |  | 150,000 |
$75 million senior unsecured private placement notes (2020) |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 75,000 |  | 75,000 |
Effective interest rate |  | 2.71% |  |  |
Debt Instrument, Maturity Date |  | Oct. 14, 2032 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 75,000 |  | 75,000 |
$75 million senior unsecured private placement notes (2022) |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 75,000 |  | 75,000 |
Effective interest rate |  | 4.90% |  |  |
Debt Instrument, Maturity Date |  | Oct. 12, 2033 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 75,000 |  | 75,000 |
$75 million senior unsecured private placement notes - second tranche (2022) |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  | $ 75,000 |  | 75,000 |
Effective interest rate |  | 4.95% |  |  |
Debt Instrument, Maturity Date |  | Oct. 12, 2034 |  |  |
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  | $ 75,000 |  | $ 75,000 |
New unsecured debt (2022) |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Weighted average interest rates (in hundredths) |  |  |  | 3.82% | 2.40%
Proceeds from unsecured debt |  |  |  | $ 525,000 | $ 175,000
Unsecured debt repaid |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Effective interest rate |  |  |  | 3.03% | 2.34%
Unsecured debt, carrying amount repaid |  |  |  | $ 75,000 | $ 40,000
Unsecured debt refinanced |  |  |  |  |
Unsecured Debt [Line Items] |  |  |  |  |
Long-Term Debt, Gross |  |  |  | $ 100,000 | $ 100,000
Basis point reduction in credit spread |  |  |  | 60 | 65
Payments of principal over future years [Abstract] |  |  |  |  |
Long-Term Debt, Gross |  |  |  | $ 100,000 | $ 100,000
[1] | These loans have a fixed interest rate or an effectively fixed interest rate due to interest rate swaps.
[2] | The interest rates on this unsecured term loan was comprised of LIBOR plus a margin which is subject to a pricing grid for changes in the Company’s coverage ratings. The Company entered into interest rate swap agreements (further described in Note 12) to convert the loan's LIBOR rates to an effectively fixed interest rate. The interest rate in the table above is the effectively fixed interest rates for the loan, including the effects of the interest rate swaps, as of March 31, 2023, the payoff date.
[3] | The interest rates on these unsecured term loans are comprised of Term SOFR plus a margin which is subject to a pricing grid for changes in the Company’s coverage ratings. The Company entered into interest rate swap agreements (further described in Note 12) to convert the loans’ Term SOFR rates to effectively fixed interest rates. The interest rates in the table above are the effectively fixed interest rates for the loans, including the effects of the interest rate swaps, as of December 31, 2023.
[4] | This term loan was amended and refinanced effective March 25, 2022. The margin was reduced by approximately 60 basis points, changing the effectively fixed rate from 2.39% to 1.80%, and LIBOR was replaced with Term SOFR.
[5] | This term loan was refinanced effective September 29, 2023. The margin was reduced by approximately 45 basis points, changing the effectively fixed rate from 3.06% to 2.61%.

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