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Debt (Details) € in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 USD ($)
Debt Instrument
Senior Notes	$ 498,298		$ 479,865
Debt issuance costs, net	(1,438)		(1,642)
Other Borrowings	19,677		18,974
Total debt	979,847		894,030
Less: current portion	(19,677)		(18,974)
Long-term debt	$ 960,170		875,056
3.67% Senior Notes
Debt Instrument
Senior Notes, Stated Interest Rate	3.67%	3.67%
Maturity Date	Dec. 17, 2022
Senior Notes	$ 50,000		50,000
4.10% Senior Notes [Member]
Debt Instrument
Senior Notes, Stated Interest Rate	4.10%	4.10%
Maturity Date	Sep. 19, 2023
Senior Notes	$ 50,000		50,000
3.84% Senior Notes [Member]
Debt Instrument
Senior Notes, Stated Interest Rate	3.84%	3.84%
Maturity Date	Sep. 19, 2024
Senior Notes	$ 125,000		125,000
4.24% Senior Notes [Member]
Debt Instrument
Senior Notes, Stated Interest Rate	4.24%	4.24%
Maturity Date	Jun. 25, 2025
Senior Notes	$ 125,000		125,000
1.47% EURO Senior Notes [Member]
Debt Instrument
Senior Notes, Stated Interest Rate	1.47%	1.47%
Maturity Date	Jun. 17, 2030
Senior Notes	$ 149,736	€ 125,000	131,507
$800 Million 2015 Credit Agreement
Debt Instrument
Maturity Date	Dec. 17, 2020
Credit Agreement Borrowing Capacity	$ 800,000
$800 million Credit Agreement, interest at LIBOR plus 87.5 basis points	$ 461,872		$ 395,191

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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
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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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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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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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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