Fair Value Measurement (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	$ 280,881		$ 280,881		$ 260,139
Investments under executive deferred compensation plan	32,126		32,126		27,270
Private equity securities	243,149		243,149		5,890
Private equity securities measured at net asset value	6,377		6,377		6,375
Foreign currency forward contracts, assets	785		785		6,016
Obligations under executive deferred compensation plan	32,126		32,126		27,270
Foreign currency forward contracts, liabilities	42,184		42,184		3,244
Equity Securities, Purchases			203,400
Equity Securities, FV-NI, Unrealized Gain (Loss)	(26,445)	$ 10,626	34,401	$ 10,626
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	280,881		280,881		260,139
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)			15,436
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Accretion of Discount			5,306
Quoted Prices in Active Markets for Identical Items (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0		0
Investments under executive deferred compensation plan	32,126		32,126		27,270
Private equity securities	243,149		243,149		5,890
Private equity securities measured at net asset value	0		0		0
Foreign currency forward contracts, assets	0		0		0
Obligations under executive deferred compensation plan	32,126		32,126		27,270
Foreign currency forward contracts, liabilities	0		0		0
Quoted Prices in Active Markets for Similar Items (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0		0
Investments under executive deferred compensation plan	0		0		0
Private equity securities	0		0		0
Private equity securities measured at net asset value	0		0		0
Foreign currency forward contracts, assets	785		785		6,016
Obligations under executive deferred compensation plan	0		0		0
Foreign currency forward contracts, liabilities	42,184		42,184		3,244
Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	280,881		280,881		260,139
Investments under executive deferred compensation plan	0		0		0
Private equity securities	0		0		0
Private equity securities measured at net asset value	0		0		0
Foreign currency forward contracts, assets	0		0		0
Obligations under executive deferred compensation plan	0		0		0
Foreign currency forward contracts, liabilities	$ 0		$ 0		$ 0