Income Taxes (Tables) (annual)

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The components of the Company's income tax expense for the years ended December 31, 2021, 2020 and 2019 are as follows:

	Year ended December 31,
	2021		2020		2019
	(dollars in thousands)
Current tax expense/(benefit)
Federal	$	92,390	$	13,840	$	(731)
State and local	21,842		5,060		457
Foreign	1,867		1,355		1,831
Total	$	116,099	$	20,255	$	1,557
Deferred tax expense/(benefit)
Federal	$	(10,163)	$	53,231	$	10,242
State and local	(4,861)		17,337		3,598
Foreign	964		(450)		(544)
Total	(14,060)		70,118		13,296
Total tax expense/(benefit)	$	102,039	$	90,373	$	14,853

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The reconciliations of the Company's federal statutory rate to the effective income tax rate for the years ended December 31, 2021, 2020, and 2019 are as follows:

	Year ended December 31,
	2021		2020		2019
Pre-tax net income at U.S. statutory rate	21.0	%	21.0	%	21.0	%
Nondeductible expenses	2.6		1.5		4.1
State and foreign tax	5.0		7.3		8.0
Reversal of income attributable to non-controlling interests	(0.4)		0.7		(9.2)
Other, net	(3.1)		(0.1)		(2.9)
Total	25.1	%	30.4	%	21.0	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The components of the Company's deferred tax assets and liabilities as of December 31, 2021 and 2020 are as follows:

	As of December 31,
	2021		2020
	(dollars in thousands)
Deferred tax assets, net of valuation allowance
Net operating loss	$	14,649	$	18,039
Deferred compensation	34,342		24,068
Tax credits	3,241		6,230
Lease liability	24,373		20,401
Other	7,134		7,371
Total deferred tax assets	83,739		76,109
Valuation allowance	(4,226)		(5,194)
Deferred tax assets, net of valuation allowance	79,513		70,915
Deferred tax liabilities
Right-of-use on certain assets	(22,568)		(19,443)
Unrealized gains on investments	(30,393)		(33,439)
Other	(4,787)		(9,003)
Total deferred tax liabilities	(57,748)		(61,885)
Deferred tax assets/(liabilities), net	$	21,765	$	9,030

Summary of Operating Loss Carryforwards [Table Text Block]

The Company has the following net operating loss carryforwards at December 31, 2021:

Jurisdiction:	Federal	New York State	New York City	Hong Kong
Net operating loss (in millions)	$16.9	$31.9	$64.5	$13.3
Year of expiration	2030	2034	2034	Indefinite

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

The components of unrecognized tax benefits are as follows:

	As of December 31,
	2021		2020
	(dollars in thousands)
Beginning balance at January 1	$	299	$	299
Settlement of positions	(64)		—
Increases/(Decreases) due to prior year positions	(235)		—
Ending balance at December 31	$	—	$	299

Summary of Income Tax Examinations

Jurisdiction:	Federal	New York State	New York City	United Kingdom	Luxembourg	Germany	Switzerland
Tax Year	2018	2018	2018	2017	2019	2017	2016