Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Basis differences related to financial derivatives	$ 63,982	$ 100,099
Allowance for losses	3,452	3,690
Unrealized losses on cash flow hedges	1,427	6,065
Stock-based compensation	1,462	1,027
Capital loss carryforwards	32	86
Valuation allowance	(32)	(86)
Other	394	341
Total deferred tax assets	71,998	112,242
Deferred tax liability:
Basis differences related to hedged items	53,945	91,460
Unrealized gains on available-for-sale securities	2,451	2,364
Other	44	97
Total deferred tax liability	56,440	93,921
Net deferred tax asset	15,558	18,321
Capital Loss Carryforward
Deferred tax assets:
Compensation and Benefits	$ 1,281	$ 1,020