Income Taxes - Schedule of Deferred Tax Assets and Liablity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax asset
Basis difference of investments	$ 65,954	$ 54,445
Deferred compensation	167,251	153,978
Other deferred and accrued expenses	4,584	7,655
Net Operating loss and credit carry-forwards	2,447	4,216
Total deferred tax asset	240,236	220,294
Valuation Allowance	(2,035)	(3,973)
Deferred tax asset, net of allowance	238,201	216,321
Deferred tax liability
Depreciation and amortization	50,675	30,156
Other	0	3,384
Deferred tax liability	50,675	33,540
Net deferred tax asset	$ 187,526	$ 182,781