Debt (Summary Of Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Debt [Line Items]
Short-term debt	$ 12,350	$ 7,839
Term loan unsecured debt	97,915	110,846
Long-term Debt, Total	97,915	110,846
Total debt	110,265	118,685
Current portion	43,348
Non-current portion	54,567	110,846
4.225% Term Loan, Due May 2022 [Member]
Debt [Line Items]
Term loan unsecured debt	24,567	29,257
Long-term Debt, Total	$ 24,567	29,257
Interest rate	4.225%
Maturity date of term loan unsecured debt	May 01, 2022
3.59% Term Loan, Due May 2022 [Member]
Debt [Line Items]
Term loan unsecured debt	$ 30,000	30,000
Long-term Debt, Total	$ 30,000	30,000
Interest rate	3.59%
Maturity date of term loan unsecured debt	May 01, 2022
6.385% Term Loan, Due May 2016 [Member]
Debt [Line Items]
Term loan unsecured debt	$ 43,348	51,589
Long-term Debt, Total	$ 43,348	$ 51,589
Interest rate	6.385%
Maturity date of term loan unsecured debt	May 01, 2016

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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