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Income Taxes - Summary Of Difference Between Statutory Rate for Federal Income Tax and Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended			24 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense calculated at the federal statutory rate	$ 26,215	$ 19,730	$ 19,931
State and local taxes, net of federal benefit	2,021	1,978	1,606
Tax on foreign earnings, net of tax credits and deductions	593	172	(69)
Tax reform adjustment	0	(195)	(3,418)	$ (3,600)
Write off of Deferred Tax Assets	0	509	0
Deferred credit	(802)	(802)	(1,053)
Stock-based awards	(3,011)	(651)	(179)
Tax reform	0	126	574
Deduction for FDII	(2,283)	0	0
Other	964	687	483
State/Local tax credits	(793)	(1,253)	(1,187)
Foreign tax credits	0	(727)	0
Change in liability for uncertain tax positions	1,325	1,102	1,141
Other	160	90	(6)
Income tax provision (benefit), Total	$ 24,389	$ 20,766	$ 17,823
Income tax expense calculated at the federal statutory rate	21.00%	21.00%	35.00%
State and local taxes, net of federal benefit	1.60%	2.10%	2.80%
Tax on foreign earnings, net of tax credits and deductions	0.40%	0.20%	(0.10%)
Tax reform adjustment	0.00%	(0.20%)	(6.00%)
Write off of Deferred Tax Assets	0.00%	0.60%	0.00%
Deferred credit	(0.60%)	(0.90%)	(1.90%)
Stock-based awards	(2.40%)	(0.70%)	(0.30%)
Tax reform		0.10%	1.00%
Deduction for FDII	(1.80%)	0.00%	0.00%
Other	0.80%	0.70%	0.90%
State/Local tax credits	(0.60%)	(1.30%)	(2.10%)
Foreign tax credits	0.00%	(0.80%)	0.00%
Change in liability for uncertain tax positions	1.00%	1.20%	2.00%
Other	0.10%	0.10%	0.00%
Effective Income Tax Rate Reconciliation, Percent	19.50%	22.10%	31.30%

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