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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.

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Debt (Details) € in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
Debt (Details) € in Thousands, $ in Thousands	Sep. 30, 2020 USD ($) Rate	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Rate	Sep. 30, 2019 USD ($)	Sep. 30, 2020 EUR (€) Rate	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 775,845		$ 775,845
Unamortized Debt Issuance Expense	(2,080)		(2,080)
Line of Credit Facility, Fair Value of Amount Outstanding	392,029		392,029
Total debt	1,224,247		1,224,247
Debt, Current	(55,111)		(55,111)
Long-term Debt	1,169,136		$ 1,169,136
Debt Instrument, Term			15 years
Line of Credit Facility, Remaining Borrowing Capacity	700,700		$ 700,700
Cash and Cash Equivalents, at Carrying Value	153,686	$ 120,534	153,686	$ 120,534		$ 207,785	$ 178,110
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax	11,200	$ 5,300	11,300	$ 6,300
Cumulative (gain) loss in other other comprehensive income related to the change in a net investment hedge.	12,800		12,800
Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	473,809		473,809
Unamortized Debt Issuance Expense	(1,191)		(1,191)
Line of Credit Facility, Fair Value of Amount Outstanding	321,005		321,005
Total debt	796,395		796,395
Debt, Current	(374)		(374)
Long-term Debt	796,021		796,021
Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	302,036		302,036
Unamortized Debt Issuance Expense	(889)		(889)
Line of Credit Facility, Fair Value of Amount Outstanding	71,024		71,024
Total debt	427,852		427,852
Debt, Current	(54,737)		(54,737)
Long-term Debt	$ 373,115		$ 373,115
3.67% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	3.67%		3.67%		3.67%
Debt Instrument, Maturity Date			Dec. 17, 2022
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 50,000		$ 50,000
Debt Instrument, Term			10 years
3.67% Senior Notes [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	50,000		$ 50,000
3.67% Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 0		$ 0
4.10% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	4.10%		4.10%		4.10%
Debt Instrument, Maturity Date			Sep. 19, 2023
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 50,000		$ 50,000
Debt Instrument, Term			10 years
4.10% Senior Notes [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	50,000		$ 50,000
4.10% Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 0		$ 0
3.84% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	3.84%		3.84%		3.84%
Debt Instrument, Maturity Date			Sep. 19, 2024
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 125,000		$ 125,000
Debt Instrument, Term			10 years
3.84% Senior Notes [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	125,000		$ 125,000
3.84% Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 0		$ 0
4.24% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	4.24%		4.24%		4.24%
Debt Instrument, Maturity Date			Jun. 25, 2025
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 125,000		$ 125,000
Debt Instrument, Term			10 years
4.24% Senior Notes [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	125,000		$ 125,000
4.24% Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 0		$ 0
3.91% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	3.91%		3.91%		3.91%
Debt Instrument, Maturity Date			Jun. 25, 2029
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 75,000		$ 75,000
Debt Instrument, Term			10 years
3.91% Senior Notes [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	75,000		$ 75,000
3.91% Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 0		$ 0
3.19% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	3.19%		3.19%		3.19%
Debt Instrument, Maturity Date			Jan. 24, 2035
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 50,000		$ 50,000
3.19% Senior Notes [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	50,000		50,000
3.19% Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 0		$ 0
1.47% EURO Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	1.47%		1.47%		1.47%
Euro Notes - USD Amount	$ 145,637		$ 145,637
Debt Instrument, Maturity Date			Jun. 17, 2030
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes \| €					€ 125,000
Debt Instrument, Term			15 years
1.47% EURO Senior Notes [Member] \| Us Dollar Amounts Member
Debt Instrument [Line Items]
Euro Notes - USD Amount	0		$ 0
1.47% EURO Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Debt Instrument [Line Items]
Euro Notes - USD Amount	$ 145,637		$ 145,637
1.30% Euro-Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	1.30%		1.30%		1.30%
Euro Notes - USD Amount	$ 157,288		$ 157,288
Debt Instrument, Maturity Date			Nov. 06, 2034
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes \| €					€ 135
Debt Instrument, Term			15 years
1.30% Euro-Senior Notes [Member] \| Us Dollar Amounts Member
Debt Instrument [Line Items]
Euro Notes - USD Amount	0		$ 0
1.30% Euro-Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Debt Instrument [Line Items]
Euro Notes - USD Amount	$ 157,288		$ 157,288
Credit facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	0.975%		0.975%		0.975%
Debt Instrument, Maturity Date			Jun. 15, 2023
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 1,100,000		$ 1,100,000
Other local arrangements [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Other Borrowings	56,373		56,373
Other local arrangements [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Other Borrowings	1,581		1,581
Other local arrangements [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Other Borrowings	$ 54,792		$ 54,792
Swiss Pension Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	0.85%		0.85%		0.85%
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Loan from Swiss Pension Plan USD Amount	$ 39,600		$ 39,600
Swiss Pension Loans (local currency)	$ 38,000		$ 38,000