Fair Value Measurements (Fair Values of Financial Instruments Measured On Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	$ 15,000
Investment in Consensus	72,535	$ 229,200
Contingent consideration	3,000
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	15,000
Investment in Consensus	72,535	229,200
Total assets measured at fair value	186,455	373,455
Contingent consideration	3,047	5,775
Debt	1,015,010	1,345,311
Total liabilities measured at fair value	1,018,057	1,351,086
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	15,000
Investment in Consensus	72,535	229,200
Total assets measured at fair value	186,455	373,455
Contingent consideration	3,047	5,775
Debt	1,102,201	1,090,627
Total liabilities measured at fair value	1,105,248	1,096,402
Money market and other funds \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market and other funds	98,920	144,255
Money market and other funds \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market and other funds	98,920	144,255
Level 1 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0
Investment in Consensus	72,535	229,200
Total assets measured at fair value	171,455	373,455
Contingent consideration	0	0
Debt	1,015,010	1,345,311
Total liabilities measured at fair value	1,015,010	1,345,311
Level 1 \| Money market and other funds \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market and other funds	98,920	144,255
Level 2 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0
Investment in Consensus	0	0
Total assets measured at fair value	0	0
Contingent consideration	0	0
Debt	0	0
Total liabilities measured at fair value	0	0
Level 2 \| Money market and other funds \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market and other funds	0	0
Level 3 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	15,000
Investment in Consensus	0	0
Total assets measured at fair value	15,000	0
Contingent consideration	3,047	5,775
Debt	0	0
Total liabilities measured at fair value	3,047	5,775
Level 3 \| Money market and other funds \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market and other funds	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of liability recognized arising from contingent consideration in a business combination.

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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