Fair Value - Narrative (Details)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other investments	$ 81,434,000	$ 77,959,000
Fair value assets level 2 to level 3 transfers amount	0
Other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other investments	$ 4,767,000	6,015,000
Revenue growth rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisition-related contingent liability	0.020		0.020
Revenue growth rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisition-related contingent liability	0.839		1.356
Revenue growth rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisition-related contingent liability	0.079		0.090
Discount rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisition-related contingent liability	0.019		0.019
Discount rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisition-related contingent liability	0.104		0.200
Discount rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisition-related contingent liability	0.070		0.108
Start-up company
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other investments		300,000
Equity method investee
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other investments	$ 1,600,000	2,900,000
Broker dealer exchange memberships
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other investments	2,800,000
Mutual Fund | Other | Fair Value, Inputs, Level 1 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	$ 7,900,000	$ 9,100,000