Fair Value Measurements - Valuation and Inputs, at FV (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair value inputs, quantitative information
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed	$ 113,717	$ 117,503	$ 167,889	$ 158,727
Recurring
Fair value inputs, quantitative information
Asset, fair value	308,341	336,973
Liabilities, fair value	(593)	(7,840)
Recurring | Level 3 inputs
Fair value inputs, quantitative information
Asset, fair value	113,717	125,131
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed		9,300
Liabilities, fair value		(7,628)
Loans Receivable
Fair value inputs, quantitative information
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed		9,348	9,859	9,786
Loans, held for sale, at fair value
Fair value inputs, quantitative information
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed			58,330	60,924
Investment in unconsolidated joint ventures
Fair value inputs, quantitative information
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed	7,169	7,360	7,913	8,094
Investment in unconsolidated joint ventures | Recurring | Level 3 inputs
Fair value inputs, quantitative information
Asset, fair value	$ 7,169	$ 7,360
Investment in unconsolidated joint ventures | Recurring | Level 3 inputs | Income Approach | Measurement Input, Discount Rate
Fair value inputs, quantitative information
Equity Securities, FV-NI, Measurement Input	0.090	0.090
Investment in unconsolidated joint ventures | Recurring | Level 3 inputs | Income Approach | Measurement Input, Discount Rate | Weighted Average
Fair value inputs, quantitative information
Equity Securities, FV-NI, Measurement Input	0.090	0.090
Preferred Equity investments
Fair value inputs, quantitative information
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed	$ 106,548	$ 108,423	108,423	108,423
Preferred Equity investments | Recurring | Level 3 inputs
Fair value inputs, quantitative information
Asset, fair value	$ 106,548	$ 108,423
Preferred Equity investments | Recurring | Level 3 inputs | Income Approach | Measurement Input, Discount Rate
Fair value inputs, quantitative information
Equity Securities, FV-NI, Measurement Input	0.100	0.100
Preferred Equity investments | Recurring | Level 3 inputs | Income Approach | Measurement Input, Discount Rate | Weighted Average
Fair value inputs, quantitative information
Equity Securities, FV-NI, Measurement Input	0.100	0.100
Contingent Consideration
Fair value inputs, quantitative information
Liabilities valued using quoted or transaction prices in which quantitative unobservable inputs are not developed		$ 7,628	$ 16,636	$ 28,500
CER dividends | Mosaic | Recurring | Level 3 inputs
Fair value inputs, quantitative information
Liabilities, fair value		$ (1,591)
CER dividends | Mosaic | Recurring | Level 3 inputs | Monte Carlo Simulation Model | Measurement Input, Equity Volatility
Fair value inputs, quantitative information
Contingent Consideration Liability, Measurement Input		0.300
CER dividends | Mosaic | Recurring | Level 3 inputs | Monte Carlo Simulation Model | Measurement Input, Equity Volatility | Weighted Average
Fair value inputs, quantitative information
Contingent Consideration Liability, Measurement Input		0.30
CER dividends | Mosaic | Recurring | Level 3 inputs | Monte Carlo Simulation Model | Measurement Input, Risk Free Interest Rate
Fair value inputs, quantitative information
Contingent Consideration Liability, Measurement Input		0.047
CER dividends | Mosaic | Recurring | Level 3 inputs | Monte Carlo Simulation Model | Measurement Input, Risk Free Interest Rate | Weighted Average
Fair value inputs, quantitative information
Contingent Consideration Liability, Measurement Input		0.047
CER dividends | Mosaic | Recurring | Level 3 inputs | Monte Carlo Simulation Model | Measurement Input, Discount Rate
Fair value inputs, quantitative information
Contingent Consideration Liability, Measurement Input		0.115
CER dividends | Mosaic | Recurring | Level 3 inputs | Monte Carlo Simulation Model | Measurement Input, Discount Rate | Weighted Average
Fair value inputs, quantitative information
Contingent Consideration Liability, Measurement Input		0.115
CER units | Mosaic | Recurring | Level 3 inputs
Fair value inputs, quantitative information
Liabilities, fair value		$ (6,037)
CER units | Mosaic | Recurring | Level 3 inputs | Income Approach and PWERM | Measurement Input, Revaluation Discount Rate
Fair value inputs, quantitative information
Contingent Consideration Liability, Measurement Input		0.120
CER units | Mosaic | Recurring | Level 3 inputs | Income Approach and PWERM | Measurement Input, Revaluation Discount Rate | Weighted Average
Fair value inputs, quantitative information
Contingent Consideration Liability, Measurement Input		0.120
CER units | Mosaic | Recurring | Level 3 inputs | Income Approach and PWERM | Measurement Input, Discount Rate
Fair value inputs, quantitative information
Contingent Consideration Liability, Measurement Input		0.115
CER units | Mosaic | Recurring | Level 3 inputs | Income Approach and PWERM | Measurement Input, Discount Rate | Weighted Average
Fair value inputs, quantitative information
Contingent Consideration Liability, Measurement Input		0.115