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Income Taxes - Reconciliation of effective tax rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Expected income tax expense (benefit) computed on pre-tax income at weighted average income tax rate	$ 158,269	$ 111,947	$ 149,799
Addition (reduction) in income tax expense (benefit) resulting from:
Tax-exempt investment income	(23,572)	(1,824)	(3,091)
Meals and entertainment	379	547	1,134
State taxes, net of U.S. federal tax benefit	20,978	5,027	3,314
Foreign branch taxes	1,998	2,094	1,231
Prior year adjustment	(1,432)	3,983	632
Foreign exchange gains & losses	1,190	(1,736)	436
Changes in applicable tax rate	447	0	0
Dividend withholding taxes	12,211	7,105	6,510
Change in valuation allowance	(40,425)	13,190	1,628
Contingent consideration	0	9	190
Share based compensation	(5,339)	(2,533)	(6,592)
Effective Income Tax Reconciliation, Intercompany Loan Writeoff, Amount	0	(22,083)	0
Other	3,878	(3,888)	619
Income tax expense	$ 128,582	$ 111,838	$ 155,810

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the year/accounting period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to withholding taxes on dividends.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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