Fair Value Measurements - Valuation and Inputs, at FV (Details) $ in Thousands	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	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	$ 124,542	$ 113,717	$ 125,131	$ 182,959	$ 184,525	$ 187,227
Recurring
Fair value inputs, quantitative information
Asset, fair value	322,062		336,973
Liabilities, fair value	6,564		7,840
Recurring | Level 3 inputs
Fair value inputs, quantitative information
Assets, fair value	115,397		115,783
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed	9,100		9,300
Asset, fair value	124,542		125,131
Liabilities, fair value	526		7,628
Liabilities valued using quoted or transaction prices in which quantitative unobservable inputs are not developed	3,400
Liabilities, fair value	3,926		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	9,773	9,859	9,786
Loans, held for sale
Fair value inputs, quantitative information
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed	9,145			57,032	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	6,974	7,169	7,360	7,731	7,913	8,094
Investment in unconsolidated joint ventures | Recurring | Level 3 inputs
Fair value inputs, quantitative information
Assets, fair value	$ 6,974		$ 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	$ 108,423	$ 106,548	$ 108,423	108,423	108,423	108,423
Preferred Equity investments | Recurring | Level 3 inputs
Fair value inputs, quantitative information
Assets, fair value	$ 108,423		$ 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	0.110		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	0.110		0.100
Contingent Consideration
Fair value inputs, quantitative information
Liabilities valued using quoted or transaction prices in which quantitative unobservable inputs are not developed	$ (3,926)		$ (7,628)	$ (15,566)	$ (16,636)	$ (28,500)
Contingent Consideration | Madison One | Recurring | Level 3 inputs
Fair value inputs, quantitative information
Liabilities, fair value	$ 526
Contingent Consideration | Madison One | Recurring | Level 3 inputs | Monte Carlo Simulation Model | Measurement Input, Net Income Volatility
Fair value inputs, quantitative information
Contingent Consideration Liability, Measurement Input	0.660
Contingent Consideration | Madison One | Recurring | Level 3 inputs | Monte Carlo Simulation Model | Measurement Input, Net Income Volatility | Weighted Average
Fair value inputs, quantitative information
Contingent Consideration Liability, Measurement Input	0.660
Contingent Consideration | Madison One | Recurring | Level 3 inputs | Monte Carlo Simulation Model | Risk-adjusted Discount Rate
Fair value inputs, quantitative information
Contingent Consideration Liability, Measurement Input	0.475
Contingent Consideration | Madison One | Recurring | Level 3 inputs | Monte Carlo Simulation Model | Risk-adjusted Discount Rate | Weighted Average
Fair value inputs, quantitative information
Contingent Consideration Liability, Measurement Input	0.475
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