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Debt And Credit Agreements (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended
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Dec. 31, 2013 | Apr. 23, 2012 Unsecured Revolving Credit Facility | Apr. 23, 2012 Previous Unsecured Revolving Credit Facility
Line of Credit Facility [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 350,000,000 | $ 300,000,000
Line of credit facility, term |  | 5 years | 4 years
Line of credit facility, option to increase additional amount |  | 75,000,000 |
Amount borrowed under the Credit Agreement |  | 102,000,000 |
Credit spread over LIBOR, basis points | 1.80% |  |
Line of credit facility, covenant terms, maximum debt to EBITDA ratio | 3.0 |  |
Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio | 2.5 |  |
Line of credit facility, covenant terms, maximum aggregate distributions | 100,000,000 |  |
Line of credit facility, covenant terms, percentage of distributions to net income | 50.00% |  |
Line of credit facility, covenant terms, minimum shareholders' equity | 320,000,000 |  |
Line of credit facility, covenant terms, percentage of shareholders' equity to net income | 50.00% |  |
Available credit under the Credit Agreement | $ 165,000,000 |  |

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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, minimum adjusted EBIT-to-interest expense ratio. + References No definition available. + Details
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- Definition Line of credit facility, covenant terms, minimum shareholders' equity. + 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 Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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