Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Deferred compensation	$ 19,105	$ 26,271
Deferred rent and lease incentives	10,303	15,354
Net operating losses and credits	10,535	4,917
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	2,663	3,554
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	1,104	1,992
Deferred Tax Assets, Tax Deferred Expense, Auction Rate Securities Reserves	540	1,194
Involuntary conversion	1,670	2,381
Deferred Tax Assets, Tax Deferred Expense, Depreciation	500	1,446
Other	1,177	1,953
Total deferred tax assets	47,597	59,062
Valuation allowance	1,350	1,280
Deferred tax assets after valuation allowance	46,247	57,782
Deferred tax liabilities:
Goodwill	40,534	57,117
Partnership investments	9,184	6,042
Company-owned life insurance	7,426	7,478
Other	195	282
Deferred Tax Liabilities, Gross	57,339	70,919
Total deferred tax liabilities	$ (11,092)	$ (13,137)