Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Assets
Marketable equity securities	$ 4,747	$ 4,490
Securities held in Non-Qualified Deferred Compensation trust, or NQDC	60,134	55,605
Foreign currency exchange contracts		5,306
Total Assets	628,952	613,774
Liabilities
Foreign currency exchange contracts	573
Total Liabilities	573
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises
Assets
Mortgage-backed and asset-backed securities	8,983
Money Market Funds
Assets
Money market funds	555,088	548,373
Fair Value Measurements, Level 1 [Member]
Assets
Marketable equity securities	4,747	4,490
Securities held in Non-Qualified Deferred Compensation trust, or NQDC	60,134	55,605
Foreign currency exchange contracts		0
Total Assets	619,969	608,468
Liabilities
Foreign currency exchange contracts	0
Total Liabilities	0
Fair Value Measurements, Level 1 [Member] \| Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises
Assets
Mortgage-backed and asset-backed securities	0
Fair Value Measurements, Level 1 [Member] \| Money Market Funds
Assets
Money market funds	555,088	548,373
Fair Value Measurements, Level 2 [Member]
Assets
Marketable equity securities	0	0
Securities held in Non-Qualified Deferred Compensation trust, or NQDC	0	0
Foreign currency exchange contracts		5,306
Total Assets	8,983	5,306
Liabilities
Foreign currency exchange contracts	573
Total Liabilities	573
Fair Value Measurements, Level 2 [Member] \| Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises
Assets
Mortgage-backed and asset-backed securities	8,983
Fair Value Measurements, Level 2 [Member] \| Money Market Funds
Assets
Money market funds	0	0
Fair Value Measurements, Level 3 [Member]
Assets
Marketable equity securities	0	0
Securities held in Non-Qualified Deferred Compensation trust, or NQDC	0	0
Foreign currency exchange contracts		0
Total Assets	0	0
Liabilities
Foreign currency exchange contracts	0
Total Liabilities	0
Fair Value Measurements, Level 3 [Member] \| Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises
Assets
Mortgage-backed and asset-backed securities	0
Fair Value Measurements, Level 3 [Member] \| Money Market Funds
Assets
Money market 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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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Fair value of financial and nonfinancial obligations.

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