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Quarterly Financial Data - Unaudited (Tables) | 12 Months Ended
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Dec. 31, 2014
Quarterly Financial Data [Abstract] |
Quarterly Financial Data |
2014 |  | Q1 |  | Q2 |  | Q3 |  | Q4 |  | Total
Total revenue |  | $ | 22,322 |  |  | $ | 21,952 |  |  | $ | 25,599 |  |  | $ | 27,101 |  |  | $ | 96,974 |
Operating income |  | 4,362 |  |  | 5,085 |  |  | 5,840 |  |  | 6,699 |  |  | 21,986 |
Net income |  | 2,856 |  |  | 3,385 |  |  | 3,883 |  |  | 4,004 |  |  | 14,128 |
Net income per share - Basic |  | 0.23 |  |  | 0.27 |  |  | 0.31 |  |  | 0.32 |  |  | 1.14 |
Net income per share - Diluted |  | 0.23 |  |  | 0.27 |  |  | 0.30 |  |  | 0.32 |  |  | 1.11 |
2013 |  | Q1 |  | Q2 |  | Q3 |  | Q4 |  | Total
Total revenue |  | $ | 23,983 |  |  | $ | 20,258 |  |  | $ | 21,865 |  |  | $ | 23,142 |  |  | $ | 89,248 |
Operating income |  | 6,138 |  |  | 5,844 |  |  | 5,088 |  |  | 4,950 |  |  | 22,020 |
Net income |  | 3,994 |  |  | 3,844 |  |  | 3,394 |  |  | 3,158 |  |  | 14,390 |
Net income per share - Basic |  | 0.33 |  |  | 0.31 |  |  | 0.28 |  |  | 0.25 |  |  | 1.17 |
Net income per share - Diluted |  | 0.32 |  |  | 0.31 |  |  | 0.27 |  |  | 0.25 |  |  | 1.15 |

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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=35737889&loc=d3e1280-108306 + Details
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