Fair Value Measurements - Hierarchy Table (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Liabilities:
Investment fair value	$ 305,960	$ 309,697
PCS Mosaic
Liabilities:
Investment fair value	23,323	23,323
Warrants
Assets:
Derivative asset total		3,564
Fair Value, Measurements, Recurring
Assets:
Derivative asset total	327,877	328,563
Liabilities:
Total	31,420	30,362
Fair Value, Measurements, Recurring | Long-term investments
Assets:
Derivative asset total	282,637	286,375
Fair Value, Measurements, Recurring | Precious metal and commodity inventories recorded at fair value
Assets:
Derivative asset total	36,696	32,896
Fair Value, Measurements, Recurring | Economic interests in loans
Assets:
Derivative asset total	4,980	5,728
Fair Value, Measurements, Recurring | Commodity contracts on precious metal and commodity inventories
Liabilities:
Financial instruments total	379	247
Fair Value, Measurements, Recurring | Warrants
Assets:
Derivative asset total	3,564
Fair Value, Measurements, Recurring | Other precious metal liabilities
Liabilities:
Financial instruments total	31,041	30,115
Fair Value, Measurements, Recurring | Level 1
Assets:
Derivative asset total	267,956	266,935
Liabilities:
Total	31,041	30,115
Fair Value, Measurements, Recurring | Level 1 | Long-term investments
Assets:
Derivative asset total	231,260	234,039
Fair Value, Measurements, Recurring | Level 1 | Precious metal and commodity inventories recorded at fair value
Assets:
Derivative asset total	36,696	32,896
Fair Value, Measurements, Recurring | Level 1 | Economic interests in loans
Assets:
Derivative asset total	0	0
Fair Value, Measurements, Recurring | Level 1 | Commodity contracts on precious metal and commodity inventories
Liabilities:
Financial instruments total	0	0
Fair Value, Measurements, Recurring | Level 1 | Warrants
Assets:
Derivative asset total	0	0
Fair Value, Measurements, Recurring | Level 1 | Other precious metal liabilities
Liabilities:
Financial instruments total	31,041	30,115
Fair Value, Measurements, Recurring | Level 2
Assets:
Derivative asset total	0	0
Liabilities:
Total	379	247
Fair Value, Measurements, Recurring | Level 2 | Long-term investments
Assets:
Derivative asset total	0	0
Fair Value, Measurements, Recurring | Level 2 | Precious metal and commodity inventories recorded at fair value
Assets:
Derivative asset total	0	0
Fair Value, Measurements, Recurring | Level 2 | Economic interests in loans
Assets:
Derivative asset total	0	0
Fair Value, Measurements, Recurring | Level 2 | Commodity contracts on precious metal and commodity inventories
Liabilities:
Financial instruments total	379	247
Fair Value, Measurements, Recurring | Level 2 | Warrants
Assets:
Derivative asset total	0	0
Fair Value, Measurements, Recurring | Level 2 | Other precious metal liabilities
Liabilities:
Financial instruments total	0	0
Fair Value, Measurements, Recurring | Level 3
Assets:
Derivative asset total	59,921	61,628
Liabilities:
Total	0	0
Fair Value, Measurements, Recurring | Level 3 | Long-term investments
Assets:
Derivative asset total	51,377	52,336
Fair Value, Measurements, Recurring | Level 3 | Precious metal and commodity inventories recorded at fair value
Assets:
Derivative asset total	0	0
Fair Value, Measurements, Recurring | Level 3 | Economic interests in loans
Assets:
Derivative asset total	4,980	5,728
Fair Value, Measurements, Recurring | Level 3 | Commodity contracts on precious metal and commodity inventories
Liabilities:
Financial instruments total	0	0
Fair Value, Measurements, Recurring | Level 3 | Warrants
Assets:
Derivative asset total	3,564	3,564
Fair Value, Measurements, Recurring | Level 3 | Other precious metal liabilities
Liabilities:
Financial instruments total	$ 0	$ 0