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Debt (Narrative) (Details)		1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 12, 2023 $ / shares	Sep. 30, 2023 USD ($) D $ / shares	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($) $ / shares	Jan. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt
Payments for repurchase of common stock					$ 43,456,000	$ 58,144,000
Proceeds from Lines of Credit					13,565,000
Unamortized debt issuance costs			$ 12,520,000		12,520,000			$ 13,775,000
Amortization of discounts, premium, and debt issuance costs					5,308,000	8,486,000
Interest Rate Swap [Member]
Debt
Gains (losses) from changes in fair values of interest rate swaps			(7,400,000)	$ 4,900,000	(1,600,000)	$ 2,700,000
2029 Convertible Notes
Debt
Debt interest rate		2.00%		2.00%		2.00%
Principal amount		$ 345,000,000.0		$ 345,000,000.0		$ 345,000,000.0
Repayment of debt		200,000,000.0
Payments for repurchase of common stock		50,000,000.0
Debt issuance costs		$ 10,800,000		10,800,000		10,800,000
Debt conversion ratio		15.8821
Debt principle amount converted into common stock		$ 1,000		$ 1,000		$ 1,000
Debt conversion price per share | $ / shares	$ 62.96	$ 62.96		$ 62.96		$ 62.96
Convertible debt, percentage of premium over the last reported sale price	35.00%
Convertible debt threshold percentage		130.00%
Convertible debt, threshold trading days | D		20
Convertible debt, threshold consecutive trading days | D		30
Threshold business days after consecutive trading period | D		5
Threshold consecutive trading period | D		5
Percentage of principal amount redeemed		100.00%
Percentage of product sale price		98.00%
Debt Instrument, Fair Value Disclosure			365,400,000		365,400,000
Unamortized debt issuance costs			8,800,000		8,800,000
Line of Credit [Member] | Line of Credit Due November 2033 | ICBC Bank
Debt
Debt issuance costs			800,000		800,000
Proceeds from Lines of Credit					$ 13,600,000
Prime rate discount percentage					0.20%
Maximum borrowing capacity							$ 40,000,000.0
Borrowings			$ 13,600,000		$ 13,600,000

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Fair value of the amount outstanding under the credit facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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The cash outflow to reacquire common stock during the period.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

No definition available.

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