Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Fair value of the amount outstanding under the credit facility.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Current period adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect.

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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		6 Months Ended
Debt (Details) € in Thousands, $ in Thousands	Jun. 30, 2016 USD ($) Rate	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Rate	Jun. 30, 2015 USD ($)	Jun. 30, 2016 EUR (€) Rate
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 486,440		$ 486,440
Unamortized Debt Issuance Expense	(1,743)		(1,743)
Total debt	714,208		714,208
Debt, Current	20,945		20,945
Long-term Debt	693,263		693,263
Gain (Loss) on Derivative Used in Net Investment Hedge, Net of Tax	2,000	$ 500	(1,600)	$ 500
Line of Credit Facility, Remaining Borrowing Capacity	588,600		588,600
Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	348,656		348,656
Unamortized Debt Issuance Expense	(1,344)		(1,344)
Total debt	506,608		506,608
Debt, Current	0		0
Long-term Debt	506,608		506,608
Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	137,784		137,784
Unamortized Debt Issuance Expense	(399)		(399)
Total debt	207,600		207,600
Debt, Current	20,945		20,945
Long-term Debt	$ 186,655		$ 186,655
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
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
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
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
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
1.47% EURO Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	1.47%		1.47%		1.47%
Debt Instrument, Maturity Date			Jun. 17, 2030
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 138,183		$ 138,183		€ 125,000
1.47% EURO Senior Notes [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	0		0
1.47% EURO Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	138,183		138,183
Credit facility [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Line of Credit Facility, Fair Value of Amount Outstanding	206,823		206,823
Credit facility [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Line of Credit Facility, Fair Value of Amount Outstanding	157,952		157,952
Credit facility [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Line of Credit Facility, Fair Value of Amount Outstanding	48,871		48,871
Other local arrangements [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Other Borrowings	20,945		20,945
Other local arrangements [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Other Borrowings	0		0
Other local arrangements [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Other Borrowings	$ 20,945		$ 20,945