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Debt And Credit Agreements (Narrative) (Details) | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Mar. 01, 2016 USD ($)
Line of Credit Facility [Line Items] |  |  |
Credit spread over LIBOR, basis points | (15000.00%) | (150.00%) |
Available credit under the Credit Agreement | $ 298,000,000 | $ 298,000,000 |
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
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% |
Indebtedness To Adjusted Ebitda Ratio Less Than Or Equal To One [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit spread over LIBOR, basis points |  | (1.50%) |

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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 Line of credit facility additional borrowing capacity. + 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://fasb.org/us-gaap/role/ref/legacyRef -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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