Fair Value Measurements Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Other investments in equity securities	$ 1,718	$ 1,718
7% debentures
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	7.00%	7.00%
Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash equivalents	$ 321,656	$ 365,901
Other investments in equity securities	1,718	1,718
Reported Value Measurement \| Series 2022-1 Class A-2-I Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	98,000	98,500
Reported Value Measurement \| Series 2022-1 Class A-2-II Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	388,134	390,134
Reported Value Measurement \| Series 2021-1 Class A-2-I Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	421,019	423,269
Reported Value Measurement \| Series 2021-1 Class A-2-II Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	630,280	633,530
Reported Value Measurement \| Series 2019-1 Class A-2-I Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	355,673	357,673
Reported Value Measurement \| Series 2019-1 Class A-2-II Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	400,873	403,123
Reported Value Measurement \| Series 2018-1 Class A-2-II Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	438,724	441,099
Reported Value Measurement \| 7% debentures
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	48,574	48,237
Estimate of Fair Value Measurement \| Fair Value, Inputs, Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash equivalents	321,656	365,901
Estimate of Fair Value Measurement \| Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Other investments in equity securities	1,718	1,718
Estimate of Fair Value Measurement \| Series 2022-1 Class A-2-I Notes \| Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	91,863	92,289
Estimate of Fair Value Measurement \| Series 2022-1 Class A-2-II Notes \| Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	356,916	370,577
Estimate of Fair Value Measurement \| Series 2021-1 Class A-2-I Notes \| Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	367,486	362,572
Estimate of Fair Value Measurement \| Series 2021-1 Class A-2-II Notes \| Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	529,044	530,581
Estimate of Fair Value Measurement \| Series 2019-1 Class A-2-I Notes \| Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	338,643	341,606
Estimate of Fair Value Measurement \| Series 2019-1 Class A-2-II Notes \| Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	374,143	374,058
Estimate of Fair Value Measurement \| Series 2018-1 Class A-2-II Notes \| Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	413,155	412,754
Estimate of Fair Value Measurement \| 7% debentures \| Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt instrument	$ 49,570	$ 49,431

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of investment in equity security without readily determinable fair value.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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