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Summary Of Quarterly Results (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Data [Abstract] |
Summary of Quarterly Results (Unaudited) |
|  |  |  |  |  | Net Income Per Common Share(1)
| (Amounts in thousands, except per share amounts) | Revenues |  | Net Income |  | Basic |  | Diluted
| 2017 |  |  |  |  |  |  |
| December 31 | $ | 58,061 |  |  | $ | 17,883 |  |  | $ | 3.50 |  |  | $ | 3.50 |
| September 30 | 58,094 |  |  | 20,299 |  |  | 3.97 |  |  | 3.97 |
| June 30 | 57,190 |  |  | 20,660 |  |  | 4.04 |  |  | 4.04 |
| March 31 | 57,229 |  |  | 21,667 |  |  | 4.24 |  |  | 4.24 |
| 2016 |  |  |  |  |  |  |
| December 31 | $ | 57,253 |  |  | $ | 21,655 |  |  | $ | 4.23 |  |  | $ | 4.23 |
| September 30 | 57,120 |  |  | 21,036 |  |  | 4.11 |  |  | 4.11 |
| June 30 | 57,005 |  |  | 21,767 |  |  | 4.26 |  |  | 4.26 |
| March 31 | 55,558 |  |  | 22,019 |  |  | 4.31 |  |  | 4.31 |
_______________________ |  |  |  |  |  |  |
(1) | The total for the year may differ from the sum of the quarters as a result of weighting.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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