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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Data - Unaudited [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
|  | Quarter Ended
|  | Mar. 31 |  | Jun. 30 |  | Sept. 30 |  | Dec. 31
2015 |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ | 81,484 |  |  | $ | 83,781 |  |  | $ | 86,016 |  |  | $ | 90,387 |
Gross profit |  | $ | 42,514 |  |  | $ | 43,761 |  |  | $ | 46,265 |  |  | $ | 48,257 |
Net income |  | $ | 9,686 |  |  | $ | 13,570 |  |  | $ | 16,266 |  |  | $ | 5,463 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.62 |  |  | $ | 0.86 |  |  | $ | 1.02 |  |  | $ | 0.34 |
Diluted |  | $ | 0.60 |  |  | $ | 0.83 |  |  | $ | 0.98 |  |  | $ | 0.33 |
2014 |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ | 73,230 |  |  | $ | 78,677 |  |  | $ | 77,457 |  |  | $ | 79,896 |
Gross profit |  | $ | 36,027 |  |  | $ | 37,542 |  |  | $ | 38,147 |  |  | $ | 39,685 |
Net income |  | $ | 6,657 |  |  | $ | 5,878 |  |  | $ | 6,428 |  |  | $ | 7,372 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.44 |  |  | $ | 0.39 |  |  | $ | 0.42 |  |  | $ | 0.48 |
Diluted |  | $ | 0.43 |  |  | $ | 0.38 |  |  | $ | 0.42 |  |  | $ | 0.46 |

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- Definition Quarterly Financial Data - Unaudited [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and 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=51825399&loc=d3e1280-108306 + Details
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