Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Deferred compensation	$ 23,048	$ 18,909
Deferred rent and lease incentives	10,026	9,597
Net operating losses and credits	1,356	7,071
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	7,931	2,350
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	1,389	2,863
Deferred Tax Assets, Tax Deferred Expense, Auction Rate Securities Reserves	1,367	1,007
Involuntary conversion	1,678	1,692
Deferred Tax Assets, Tax Deferred Expense, Depreciation	0	370
Other	1,203	1,067
Total deferred tax assets	47,998	44,926
Valuation allowance	4,368	3,204
Deferred tax assets after valuation allowance	43,630	41,722
Deferred tax liabilities:
Goodwill	40,774	41,049
Partnership investments	16,163	8,227
Company-owned life insurance	10,028	6,277
Depreciation	110	0
Other	304	252
Deferred Tax Liabilities, Gross	67,379	55,805
Total deferred tax liabilities	$ (23,749)	$ (14,083)