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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] | The following summary represents the unaudited results of operations of the Company, expressed in thousands except per share amounts, for the periods from January 1, 2016 through December 31, 2017. Certain amounts have been reclassified to conform to the current presentation of discontinued operations:
|  | 2017 |
|  | Three Months Ended |
|  | March 31 |  | June 30 |  | September 30 |  | December 31 |
Revenue |  | $ | 26,560 |  | $ | 28,080 |  | $ | 30,387 |  | $ | 33,375 |
Net Income |  | $ | 14,768 |  | $ | 15,067 |  | $ | 12,283 |  | $ | 16,672 |
Earnings per Share - diluted |  | $ | 0.55 |  | $ | 0.56 |  | $ | 0.42 |  | $ | 0.55 |
|  | 2016 |
|  | Three Months Ended |
|  | March 31 |  | June 30 |  | September 30 |  | December 31 |
Revenue |  | $ | 20,224 |  | $ | 21,844 |  | $ | 24,161 |  | $ | 25,299 |
Net Income |  | $ | 7,586 |  | $ | 10,828 |  | $ | 14,476 |  | $ | 12,906 |
Earnings per Share - diluted |  | $ | 0.36 |  | $ | 0.48 |  | $ | 0.61 |  | $ | 0.50 |

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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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