Fair Value Measurements (Summarized Information About Level 3 Fair Value Measurements) (Details) - Level 3 - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Convertible Preferred Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value measurement with unobservable input	$ 15,625	$ 16,278	$ 11,618
Recurring | Convertible Preferred Securities | Implied based on market prices
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value measurement with unobservable input	$ 15,625	16,278
Nonrecurring | Frac Sand Assets | Third party appraisal
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value measurement with unobservable input		$ 9,000