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Fair Value Measurements (Fair Values of Financial Instruments Measured On Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Jan. 01, 2022	Oct. 07, 2020	Nov. 15, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment in Consensus	$ 35,300	$ 58,400
4.625% Senior Notes | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate				4.625%
1.75% Convertible Notes | Convertible Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate			1.75%		1.75%
Fair value of debt instruments	540,200	548,400
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Certificates of deposit	3,753
Investment in Consensus	35,259	58,421
Investment in corporate debt securities	16,019	15,586
Total assets measured at fair value	347,878	386,017
Contingent consideration	555	555
Total liabilities measured at fair value	939,995	939,874
Fair Value | 4.625% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt instruments	399,203	390,908
Fair Value | 1.75% Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt instruments	540,237	548,411
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Certificates of deposit	3,753
Investment in Consensus	35,259	58,421
Investment in corporate debt securities	16,019	15,586
Total assets measured at fair value	347,878	386,017
Contingent consideration	555	555
Total liabilities measured at fair value	1,000,172	999,608
Carrying Value | 4.625% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt instruments	456,498	456,400
Carrying Value | 1.75% Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt instruments	543,119	542,653
Money market and other funds | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market and other funds	292,847	312,010
Money market and other funds | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market and other funds	292,847	312,010
Level 1 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Certificates of deposit	0
Investment in Consensus	35,259	58,421
Investment in corporate debt securities	0	0
Total assets measured at fair value	328,106	370,431
Contingent consideration	0	0
Total liabilities measured at fair value	939,440	939,319
Level 1 | Fair Value | 4.625% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt instruments	399,203	390,908
Level 1 | Fair Value | 1.75% Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt instruments	540,237	548,411
Level 1 | Money market and other funds | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market and other funds	292,847	312,010
Level 2 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Certificates of deposit	3,753
Investment in Consensus	0	0
Investment in corporate debt securities	0	0
Total assets measured at fair value	3,753	0
Contingent consideration	0	0
Total liabilities measured at fair value	0	0
Level 2 | Fair Value | 4.625% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt instruments
Level 2 | Fair Value | 1.75% Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt instruments
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]
Certificates of deposit	0
Investment in Consensus	0	0
Investment in corporate debt securities	16,019	15,586
Total assets measured at fair value	16,019	15,586
Contingent consideration	555	555
Total liabilities measured at fair value	555	555
Level 3 | Fair Value | 4.625% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt instruments
Level 3 | Fair Value | 1.75% Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt instruments
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

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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 liability recognized arising from contingent consideration in a business combination.

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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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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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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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