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Debt And Credit Agreements (Narrative) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Mar. 01, 2016 USD ($) | Apr. 23, 2012 USD ($)
Line of Credit Facility [Line Items] |  |  |
Credit spread over LIBOR, basis points | 1.75% |  |
Available credit under the Credit Agreement | $ 248,000,000 |  |
Secured Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 400,000,000 |
Line Of Credit Facility Term | 5 years |  |
Line of credit facility, option to increase additional amount |  | 50,000,000 |
Amount borrowed under the Credit Agreement |  | $ 107,000,000 |
Line of credit facility, covenant terms, maximum debt to EBITDA ratio | 4.00 |  |
Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio | 2.50 |  |
Line of credit facility, covenant terms, maximum aggregate distributions | $ 100,000,000 |  |
Line of credit facility, covenant terms, percentage of shareholders' equity to net income | 50.00% |  |
Credit Facility covenant leverage ratio three times limitation | 3.00 |  |
Credit Facility limitation on dividend payments at leverage ratio greater than 3.00x | $ 4,000,000 |  |
Credit Facility, covenants, 50% of net income limitation when leverage ratio exceeds 3.00x | 50.00% |  |
Credit Facility covenant three point five times leverage ratio | 350.00% |  |
Credit Facility fixed charge coverage one pt two ratio limitation | 120.00% |  |
Unsecured Revolving Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 350,000,000

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- Definition Credit Facility, covenants, 50% of net income limitation when leverage ratio exceeds 3.00x + References No definition available. + Details
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- Definition Credit Facility covenant three point five times leverage ratio + References No definition available. + Details
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- Definition Credit Facility fixed charge coverage one pt two ratio limitation + References No definition available. + Details
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- Definition Credit Facility limitation on dividend payments at leverage ratio greater than 3.00x + References No definition available. + Details
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- Definition Credit spread over LIBOR basis points. + References No definition available. + Details
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- Definition Line of credit facility additional borrowing capacity. + References No definition available. + Details
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- Definition Line of credit facility, covenant terms, maximum aggregate dividends. + References No definition available. + Details
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- Definition Line of credit facility, covenant terms, maximum debt to EBITDA ratio + References No definition available. + Details
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- Definition Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio. + References No definition available. + Details
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- Definition Line of credit facility term. + References No definition available. + Details
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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 + Details
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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. + Details
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- Definition 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. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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