Fair Value Measurements - Valuation and Inputs, at FV (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Level 3 inputs
Fair value inputs, quantitative information
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed	$ 117,503	$ 158,727	$ 239,949
Recurring
Fair value inputs, quantitative information
Asset, fair value	336,973	339,799
Liabilities, fair value	(7,840)	(29,819)
Recurring | Level 3 inputs
Fair value inputs, quantitative information
Asset, fair value	125,131	187,227
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed	9,300	70,700
Liabilities, fair value	(7,628)	(28,500)
Liabilities valued using quoted or transaction prices in which quantitative unobservable inputs are not developed		9,000
Loans Receivable | Level 3 inputs
Fair value inputs, quantitative information
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed	9,348	9,786	10,766
Loans, held for sale, at fair value | Level 3 inputs
Fair value inputs, quantitative information
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed		60,924	231,865
Mortgage backed securities | Level 3 inputs
Fair value inputs, quantitative information
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed			1,581
Investment in unconsolidated joint ventures | Level 3 inputs
Fair value inputs, quantitative information
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed	7,360	8,094	8,894
Investment in unconsolidated joint ventures | Recurring | Level 3 inputs
Fair value inputs, quantitative information
Asset, fair value	$ 7,360	$ 8,094
Investment in unconsolidated joint ventures | Recurring | Level 3 inputs | Income Approach | Measurement Input, Discount Rate
Fair value inputs, quantitative information
Debt instrument, 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
Debt instrument, measurement input	0.090	0.090
Preferred Equity investments | Level 3 inputs
Fair value inputs, quantitative information
Assets valued using quoted or transaction prices in which quantitative unobservable inputs are not developed	$ 108,423	$ 108,423
Preferred Equity investments | Recurring | Level 3 inputs
Fair value inputs, quantitative information
Asset, 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	0.100	0.105
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	0.105
Mosaic | Recurring | Level 3 inputs
Fair value inputs, quantitative information
Asset, fair value	$ 125,100	$ 187,200
Contingent Consideration | Level 3 inputs
Fair value inputs, quantitative information
Liabilities valued using quoted or transaction prices in which quantitative unobservable inputs are not developed	7,628	28,500	$ 16,400
CER dividends | Mosaic | Recurring | Level 3 inputs
Fair value inputs, quantitative information
Liabilities, fair value	$ (1,591)	$ (4,587)
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	0.350
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	0.300	0.350
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	0.044
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	0.044
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	0.119
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	0.119
CER units | Mosaic | Recurring | Level 3 inputs
Fair value inputs, quantitative information
Liabilities, fair value	$ (6,037)	$ (14,913)
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	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	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	0.119
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	0.119