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Debt Textuals (Details) € in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Rate	Dec. 31, 2014 USD ($) Rate	Dec. 31, 2013 USD ($)	Dec. 31, 2015 EUR (€) Rate	Jun. 25, 2015 USD ($)
Debt Instrument
Derivatives used in Net Investment Hedge, Increase (Decrease), Gross of Tax	$ 3,600
Senior Notes	$ 250,000
Consolidated Interest Coverage Ratio Covenant	3.5 to 1.0
Consolidated Leverage Ratio Covenant	3.5 to 1.0
Debt issuance costs	$ 1,366	$ 941	$ 1,522
Debt, Weighted Average Interest Rate | Rate	4.71%	5.16%		4.71%
6.3% Senior Notes
Debt Instrument
Senior Notes, Stated Interest Rate		6.30%			6.30%
Senior Notes	$ 0	$ 100,000			$ 100,000
Maturity Date	Jun. 25, 2015
3.67% Percent Notes
Debt Instrument
Senior Notes, Stated Interest Rate	3.67%			3.67%
Senior Notes	$ 50,000	50,000
Maturity Date	Dec. 17, 2022
Debt Instrument, Covenant Compliance	The Company was in compliance with these covenants at December 31, 2015.
Debt issuance costs	$ 400
Amortized Issuance Costs Period	ten
4.10% Senior Notes [Member]
Debt Instrument
Senior Notes, Stated Interest Rate	4.10%			4.10%
Senior Notes	$ 50,000	50,000
Maturity Date	Sep. 19, 2023
Debt Instrument, Covenant Compliance	The Company was in compliance with these covenants at December 31, 2015.
Debt issuance costs	$ 400
Amortized Issuance Costs Period	ten
3.84% Senior Notes [Member]
Debt Instrument
Senior Notes, Stated Interest Rate	3.84%			3.84%
Senior Notes	$ 125,000	125,000
Maturity Date	Sep. 19, 2024
Debt Instrument, Covenant Compliance	The Company was in compliance with these covenants at December 31, 2015.
Debt issuance costs	$ 900
Amortized Issuance Costs Period	ten
4.24% Senior Notes [Member]
Debt Instrument
Senior Notes, Stated Interest Rate	4.24%			4.24%
Senior Notes	$ 125,000	0
Maturity Date	Jun. 25, 2025
Debt Instrument, Covenant Compliance	The Company was in compliance with these covenants at December 31, 2015.
1.47% EURO Senior Notes [Member]
Debt Instrument
Senior Notes, Stated Interest Rate	1.47%			1.47%
Senior Notes	$ 136,575	$ 0		€ 125,000
Maturity Date	Jun. 17, 2030
Debt Instrument, Covenant Compliance	The Company was in compliance with these covenants at December 31, 2015.
Debt Issuance Cost	$ 400
Amortized Issuance Costs Period	15 years
$800 Million 2015 Credit Agreement
Debt Instrument
Maturity Date	Dec. 17, 2020
Debt Instrument, Covenant Compliance	the Company was in compliance as of December 31, 2015
Amortized Issuance Costs Period	2020
Credit Agreement Borrowing Capacity	$ 800,000
$800 million Credit Agreement, Basis Spread on Variable Rate	0.875%
Interest Costs, Capitalized During Period	$ 1,100
Line of Credit Facility, Remaining Borrowing Capacity	704,700
$800 Million Credit 2013 Credit Agreement [Member]
Debt Instrument
Credit Agreement Borrowing Capacity	800,000
Gains (Losses) on Extinguishment of Debt	$ (129)

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