Fair Value - Narrative (Details)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other investments	$ 68,509,000	$ 77,959,000
Fair value assets level 2 to level 3 transfers amount	$ 0
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		0.839
Revenue growth rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisition-related contingent liability	0.079		0.130
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		0.104
Discount rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisition-related contingent liability	0.070		0.066
Other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other investments	$ 4,502,000	6,015,000
Mutual Fund | Other | Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	6,500,000	9,100,000
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	1,500,000	2,900,000
Broker dealer exchange memberships
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other investments	$ 2,700,000	$ 2,800,000