Borrowings - Additional Information (Details)									3 Months Ended	9 Months Ended
	Aug. 02, 2024	Jul. 19, 2024 USD ($)	Mar. 28, 2024 USD ($)	Dec. 15, 2021 USD ($)	Oct. 27, 2021 USD ($)	Aug. 24, 2021 USD ($)	Dec. 11, 2020 USD ($) TradingDay $ / shares	Jan. 16, 2020 USD ($)	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2023 USD ($)	May 17, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jul. 27, 2022 USD ($)	Jul. 22, 2022 USD ($)	Jan. 29, 2020 USD ($)
Debt Instrument [Line Items]
Borrowings under Credit Facilities										$ 670,400,000	$ 215,000,000
Repayments of lines of credit										593,400,000	302,500,000
Line of credit facility, borrowing availability									$ 220,000,000	220,000,000			$ 137,000,000
Outstanding aggregate principal amount									$ 922,500,000	$ 922,500,000	$ 532,500,000
Interest rate									6.00%	6.00%
Debt instrument, conversion of principal amount									$ 49,236,000	$ 49,236,000			48,757,000
2025 Notes
Debt Instrument [Line Items]
Unamortized deferred financing costs, net									600,000	600,000			2,000,000
Unamortized deferred finance costs									600,000	600,000			2,000,000
Aggregate principal amount of unsecured notes												$ 182,500,000		$ 7,500,000	$ 50,000,000
Aggregate principal amount redeemed												$ 30,000,000
Outstanding aggregate principal amount									152,500,000	$ 152,500,000
Debt instrument, maturity date								Jan. 16, 2025
Debt instrument, redemption, description										The 2025 Notes are redeemable, in whole or in part, at any time, or from time to time, at the Company’s option, on or after January 16, 2023 at a redemption price equal to 100% of the outstanding principal amount thereof, plus accrued and unpaid interest to, but excluding, the date of redemption.
Debt instrument, redemption price, percentage of principal amount redeemed								100.00%
Interest rate								7.00%
Debt instrument, interest rate terms										The 2025 Notes bear interest at a fixed rate of 7.00% per year payable quarterly on March 15, June 15, September 15, and December 15 of each year, commencing on March 15, 2020.
Financing costs capitalized and deferred									7,800,000	$ 7,800,000
2025 Notes | Unsecured Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes								$ 105,000,000	125,000,000	125,000,000						$ 20,000,000
6.00% Convertible Notes due 2025
Debt Instrument [Line Items]
Unamortized deferred finance costs									450,000	450,000			733,000
Aggregate principal amount of unsecured notes									50,000,000	$ 50,000,000			50,000,000
Debt instrument, maturity date							Dec. 11, 2025
Interest rate							6.00%
Debt instrument, interest rate terms										The Convertible Notes bear interest at a fixed rate of 6.00% per year, subject to additional interest upon certain events, payable semiannually in arrears on May 1 and November 1 of each year, beginning on May 1, 2021. If an investment grade rating is not maintained with respect to the Convertible Notes, additional interest of 0.75% per annum will accrue on the Convertible Notes until such time as the Convertible Notes have received an investment grade rating of “BBB-” (or its equivalent) or better. The rating remained at investment grade as of September 30, 2024
Financing costs capitalized and deferred							$ 1,900,000
Additional rate of interest							0.75%
Debt instrument, conversion of principal amount							$ 1,000,000		49,236,000	$ 49,236,000			48,757,000
Debt instrument, convertible, threshold consecutive trading days | TradingDay							30
Debt instrument, convertible, threshold percentage							120.00%
Percentage of repurchase price equal to principal amount of convertible notes to be repurchased							100.00%
Percentage of estimated at time of issuance that values of debt							99.10%
Percentage of embedded conversion feature of convertible notes							0.90%
6.00% Convertible Notes due 2025 | Capital in Excess of Par Value
Debt Instrument [Line Items]
Percentage of original issue discount							0.90%
Debt conversion, original issue discount of debt							$ 500,000
6.00% Convertible Notes due 2025 | Common Stock
Debt Instrument [Line Items]
Conversion notes conversion rate							66.6667			80.4623
Debt instrument, conversion of principal amount							$ 1,000,000		$ 1,000,000	$ 1,000,000
Debt instrument, initial conversion price per share | $ / shares							$ 15		$ 12.43	$ 12.43
6.00% Convertible Notes due 2025 | Private Convertible Note Offering
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes							$ 50,000,000
August 2026 Notes
Debt Instrument [Line Items]
Unamortized deferred financing costs, net									$ 1,100,000	$ 1,100,000			1,500,000
Unamortized deferred finance costs									$ 1,100,000	$ 1,100,000			$ 1,500,000
Debt instrument, maturity date						Aug. 24, 2026
Debt instrument, redemption, description										The August 2026 Notes are redeemable, in whole or in part, at any time, or from time to time, at the Company’s option, at a redemption price equal to the greater of (1) 100% of the principal amount of the August 2026 Notes to be redeemed or (2) the sum of the present values of the remaining scheduled payments of principal and interest (exclusive of accrued and unpaid interest to the date of redemption) on the August 2026 Notes to be redeemed, discounted to the redemption date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) using the applicable treasury rate plus 50 basis points, plus, in each case, accrued and unpaid interest to the redemption date; provided, however, that if the Company redeems any August 2026 Notes on or after July 24, 2026, the redemption price for the August 2026 Notes will be equal to 100% of the principal amount of the August 2026 Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the date of redemption. In addition, if a change of control repurchase event (as defined in the August 2026 Notes Indenture) occurs prior to the maturity date of the August 2026 Notes or the Company’s redemption of all outstanding August 2026 Notes, the Company will be required, subject to certain conditions, to make an offer to the holders thereof to repurchase for cash some or all of the August 2026 Notes at a repurchase price equal to 100% of the principal amount of the August 2026 Notes to be repurchased, plus accrued and unpaid interest, if any, to, but excluding, the date of repurchase.
Debt instrument, redemption price, percentage of principal amount redeemed						100.00%
Interest rate						4.375%			4.375%	4.375%			4.375%
Debt instrument, interest rate terms										The August 2026 Notes bear interest at a fixed rate of 4.375% per year payable semiannually on February 15 and August 15 of each year, commencing on February 15, 2022.
Financing costs capitalized and deferred									$ 2,900,000	$ 2,900,000
August 2026 Notes | Unsecured Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes						$ 125,000,000
December 2026 Notes
Debt Instrument [Line Items]
Unamortized deferred financing costs, net									$ 800,000	$ 800,000			$ 1,100,000
Unamortized deferred finance costs				$ 1,900,000
Debt instrument, maturity date				Dec. 15, 2026
Debt instrument, redemption, description										The December 2026 Notes are redeemable, in whole or in part, at any time, or from time to time, at the Company’s option, at a redemption price equal to the greater of (1) 100% of the principal amount of the December 2026 Notes to be redeemed or (2) the sum of the present values of the remaining scheduled payments of principal and interest (exclusive of accrued and unpaid interest to the date of redemption) on the December 2026 Notes to be redeemed, discounted to the redemption date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) using the applicable treasury rate plus 50 basis points, plus, in each case, accrued and unpaid interest to the redemption date; provided, however, that if the Company redeems any December 2026 Notes on or after November 15, 2026, the redemption price for the December 2026 Notes will be equal to 100% of the principal amount of the December 2026 Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the date of redemption. In addition, if a change of control repurchase event (as defined in the December 2026 Notes Indenture) occurs prior to the maturity date of the December 2026 Notes or the Company’s redemption of all outstanding December 2026 Notes, the Company will be required, subject to certain conditions, to make an offer to the holders thereof to repurchase for cash some or all of the December 2026 Notes at a repurchase price equal to 100% of the principal amount of the December 2026 Notes to be repurchased, plus accrued and unpaid interest, if any, to, but excluding, the date of repurchase.
Debt instrument, redemption price, percentage of principal amount redeemed				100.00%
Interest rate				4.25%					4.25%	4.25%			4.25%
Debt instrument, interest rate terms										The December 2026 Notes bear interest at a fixed rate of 4.25% per year payable semiannually on June 15 and December 15 of each year, commencing on June 15, 2022.
December 2026 Notes | Unsecured Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes				$ 75,000,000
March 2029 Notes
Debt Instrument [Line Items]
Unamortized deferred financing costs, net									$ 3,000,000	$ 3,000,000			$ 0
Unamortized deferred finance costs									$ 3,000,000	$ 3,000,000			0
Debt instrument, maturity date			Mar. 30, 2029
Debt instrument, redemption, description										The March 2029 Notes are redeemable, in whole or in part, at any time, or from time to time, at the Company's option on or after March 30, 2026 upon not less than 30 days’ nor more than 60 days’ written notice prior to the date fixed for redemption thereof, at a redemption price equal to 100% of the outstanding principal amount of the March 2029 Notes, plus accrued and unpaid interest payments otherwise payable for the then-current quarterly interest period accrued to, but excluding, the date fixed for redemption. In addition, if a change of control repurchase event (as defined in the March 2029 Notes Indenture) occurs prior to the maturity date of the March 2029 Notes, unless the Company has exercised its right to redeem the March 2029 Notes in full, holders will have the right, at their option, to require the Company to repurchase for cash some or all of the March 2029 Notes at a repurchase price equal to 100% of the principal amount of the March 2029 Notes being repurchased, plus accrued and unpaid interest, if any, to, but not including, the repurchase date.
Debt instrument, redemption price, percentage of principal amount redeemed			100.00%
Interest rate			7.875%						7.875%	7.875%
Debt instrument, interest rate terms										The March 2029 Notes bear interest at a fixed rate of 7.875% per year payable quarterly on March 30, June 30, September 30 and December 30 of each year, commencing on June 30, 2024.
Financing costs capitalized and deferred									$ 3,400,000	$ 3,400,000
March 2029 Notes | Unsecured Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes			$ 115,000,000
March 2029 Notes | Unsecured Notes | Underwriters [Member]
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes			$ 15,000,000
September 2029 Notes
Debt Instrument [Line Items]
Unamortized deferred financing costs, net									3,600,000	3,600,000			0
Unamortized deferred finance costs									$ 3,600,000	$ 3,600,000			0
Debt instrument, maturity date		Sep. 30, 2029
Debt instrument, redemption, description		The September 2029 Notes are redeemable, in whole or in part, at any time, or from time to time, at the Company's option on or after September 30, 2026 upon not less than 30 days’ nor more than 60 days’ written notice prior to the date fixed for redemption thereof, at a redemption price equal to 100% of the outstanding principal amount of the September 2029 Notes, plus accrued and unpaid interest payments otherwise payable for the then-current quarterly interest period accrued to, but excluding, the date fixed for redemption
Debt instrument, redemption price, percentage of principal amount redeemed		100.00%
Interest rate		7.875%							7.875%	7.875%
Debt instrument, interest rate terms		The September 2029 Notes bear interest at a fixed rate of 7.875% per year payable quarterly on March 30, June 30, September 30 and December 30 of each year, commencing on September 30, 2024.
Financing costs capitalized and deferred									$ 3,800,000	$ 3,800,000
September 2029 Notes | Unsecured Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes		$ 115,000,000
September 2029 Notes | Unsecured Notes | Underwriters [Member]
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes		$ 15,000,000
KeyBank Credit Facility
Debt Instrument [Line Items]
Credit facility					$ 510,000,000				290,000,000	290,000,000			213,000,000
Maximum borrowing capacity					$ 690,000,000
Variable advance rate on eligible first lien loans					62.00%
Variable advance rate on eligible second lien loans					47.00%
Line of credit facility revolving period					3 years
Line of credit facility amortization period					2 years
Line of credit facility expiration date	Jul. 27, 2029
Borrowings under Credit Facilities									330,400,000	670,400,000
Repayments of lines of credit									295,100,000	593,400,000
Unamortized deferred financing costs, net									8,000,000	8,000,000
Unamortized deferred finance costs									$ 5,900,000	$ 5,900,000			$ 2,100,000
Minimum | KeyBank Credit Facility | SOFR
Debt Instrument [Line Items]
Variable interest rate					2.85%
Maximum | KeyBank Credit Facility | SOFR
Debt Instrument [Line Items]
Variable interest rate					3.25%