Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Deferred compensation	$ 24,782	$ 23,048
Deferred rent and lease incentives	9,951	10,026
Net operating losses and credits	1,366	1,356
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	8,664	7,931
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	1,290	1,389
Deferred Tax Assets, Tax Deferred Expense, Auction Rate Securities Reserves	407	1,367
Involuntary conversion	1,693	1,678
Other	1,010	1,203
Total deferred tax assets	49,163	47,998
Valuation allowance	5,059	4,368
Deferred tax assets after valuation allowance	44,104	43,630
Deferred tax liabilities:
Goodwill	41,128	40,774
Partnership investments	32,978	16,163
Company-owned life insurance	13,037	10,028
Depreciation	1,552	110
Other	318	304
Deferred Tax Liabilities, Gross	89,013	67,379
Total deferred tax liabilities	$ (44,909)	$ (23,749)