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Summarized Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Summarized Quarterly Financial Data (Unaudited) [Abstract] |
Schedule of quarterly financial information |
|  |  |  | Quarter
2014 |  |  |  | First |  |  |  | Second |  |  |  | Third |  |  |  | Fourth
Revenues |  |  |  | $ | 116,468 |  |  |  | $ | 112,747 |  |  |  | $ | 100,756 |  |  |  | $ | 116,070
Income from operations |  |  |  |  | 25,909 |  |  |  |  | 23,998 |  |  |  |  | 9,216 |  |  |  |  | 22,624
Net income |  |  |  |  | 14,783 |  |  |  |  | 13,677 |  |  |  |  | 4,953 |  |  |  |  | 12,943
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  | $ | 1.40 |  |  |  | $ | 1.29 |  |  |  | $ | 0.47 |  |  |  | $ | 1.22
Diluted |  |  |  | $ | 1.40 |  |  |  | $ | 1.29 |  |  |  | $ | 0.46 |  |  |  | $ | 1.21
|  |  |  | Quarter
2015 |  |  |  | First |  |  |  | Second |  |  |  | Third |  |  |  | Fourth
Revenues |  |  |  | $ | 111,885 |  |  |  | $ | 109,750 |  |  |  | $ | 99,142 |  |  |  | $ | 113,660
Income from operations |  |  |  |  | 19,859 |  |  |  |  | 20,929 |  |  |  |  | 7,254 |  |  |  |  | 21,656
Net income |  |  |  |  | 11,385 |  |  |  |  | 11,874 |  |  |  |  | 3,723 |  |  |  |  | 13,041
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  | $ | 1.08 |  |  |  | $ | 1.12 |  |  |  | $ | 0.35 |  |  |  | $ | 1.23
Diluted |  |  |  | $ | 1.06 |  |  |  | $ | 1.11 |  |  |  | $ | 0.35 |  |  |  | $ | 1.21

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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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