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Debt And Credit Agreements (Schedule Of Borrowings Under Credit Agreement At Various Indebtedness To Adjusted EBITDA Levels) (Details)	12 Months Ended
	Dec. 31, 2017	Mar. 01, 2016 USD ($)
Line of Credit Facility [Line Items]
Credit Spread Over LIBOR	1.75%
Secured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Long-term Line of Credit		$ 107,000,000
Indebtedness To Adjusted Ebitda Ratio Greater Than Three Point Five But Less Than Or Equal To Four [Member]
Line of Credit Facility [Line Items]
Credit Spread Over LIBOR	2.50%
Commitment Fee	0.45%
Indebtedness To Adjusted Ebitda Ratio Greater Than Three But Less Than Or Equal To Three Point Five [Member]
Line of Credit Facility [Line Items]
Credit Spread Over LIBOR	2.25%
Commitment Fee	0.40%
Indebtedness-To-Adjusted EBITDA Ratio Greater Than 2.0x But Less Than Or Equal To 3.0x [Member]
Line of Credit Facility [Line Items]
Credit Spread Over LIBOR	2.00%
Commitment Fee	0.35%
Indebtedness-To-Adjusted EBITDA Ratio Greater Than 1.0x But Less Than Or Equal To 2.0x [Member]
Line of Credit Facility [Line Items]
Credit Spread Over LIBOR	1.75%
Commitment Fee	0.30%
Indebtedness-To-Adjusted EBITDA Ratio Less Than Or Equal To 1.0x [Member]
Line of Credit Facility [Line Items]
Indebtedness-to-Adjusted EBITDA Ratio	1.0
Credit Spread Over LIBOR	1.50%
Commitment Fee	0.25%
Minimum | Indebtedness To Adjusted Ebitda Ratio Greater Than Three Point Five But Less Than Or Equal To Four [Member]
Line of Credit Facility [Line Items]
Indebtedness-to-Adjusted EBITDA Ratio	3.5
Minimum | Indebtedness To Adjusted Ebitda Ratio Greater Than Three But Less Than Or Equal To Three Point Five [Member]
Line of Credit Facility [Line Items]
Indebtedness-to-Adjusted EBITDA Ratio	3
Minimum | Indebtedness-To-Adjusted EBITDA Ratio Greater Than 2.0x But Less Than Or Equal To 3.0x [Member]
Line of Credit Facility [Line Items]
Indebtedness-to-Adjusted EBITDA Ratio	2.0
Minimum | Indebtedness-To-Adjusted EBITDA Ratio Greater Than 1.0x But Less Than Or Equal To 2.0x [Member]
Line of Credit Facility [Line Items]
Indebtedness-to-Adjusted EBITDA Ratio	1.0
Maximum | Indebtedness To Adjusted Ebitda Ratio Greater Than Three Point Five But Less Than Or Equal To Four [Member]
Line of Credit Facility [Line Items]
Indebtedness-to-Adjusted EBITDA Ratio	4
Maximum | Indebtedness To Adjusted Ebitda Ratio Greater Than Three But Less Than Or Equal To Three Point Five [Member]
Line of Credit Facility [Line Items]
Indebtedness-to-Adjusted EBITDA Ratio	3.5
Maximum | Indebtedness-To-Adjusted EBITDA Ratio Greater Than 2.0x But Less Than Or Equal To 3.0x [Member]
Line of Credit Facility [Line Items]
Indebtedness-to-Adjusted EBITDA Ratio	3.0
Maximum | Indebtedness-To-Adjusted EBITDA Ratio Greater Than 1.0x But Less Than Or Equal To 2.0x [Member]
Line of Credit Facility [Line Items]
Indebtedness-to-Adjusted EBITDA Ratio	2.0

X

- Definition

Credit spread over LIBOR basis points.

+ References

No definition available.

+ Details

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X

- Definition

Line Of Credit Facility Covenant Terms Debt To Ebitda Ratio

+ References

No definition available.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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