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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] | ## The following table presents the unaudited consolidated operating results by quarter for the years ended December 31, 2015 and 2014:
|  | For the Three Months Ended
(in thousands, except per share data) |  | March 31, |  | June 30, |  | September 30, |  | December 31,
2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 244,148 |  |  | $ | 276,488 |  |  | $ | 269,861 |  |  | $ | 271,184 |
Gross profit |  |  | 29,374 |  |  |  | 31,736 |  |  |  | 28,620 |  |  |  | 32,611 |
Net income |  |  | 7,172 |  |  |  | 8,074 |  |  |  | 6,175 |  |  |  | 5,881 |
Basic earnings per share |  | $ | 0.35 |  |  | $ | 0.39 |  |  | $ | 0.30 |  |  | $ | 0.29 |
Diluted earnings per share |  | $ | 0.34 |  |  | $ | 0.38 |  |  | $ | 0.29 |  |  | $ | 0.29 |
2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 215,638 |  |  | $ | 228,877 |  |  | $ | 248,473 |  |  | $ | 250,979 |
Gross profit |  |  | 27,080 |  |  |  | 30,528 |  |  |  | 32,724 |  |  |  | 42,082 |
Net income |  |  | 6,272 |  |  |  | 7,741 |  |  |  | 8,404 |  |  |  | 14,127 |
Basic earnings per share |  | $ | 0.30 |  |  | $ | 0.36 |  |  | $ | 0.40 |  |  | $ | 0.68 |
Diluted earnings per share |  | $ | 0.29 |  |  | $ | 0.36 |  |  | $ | 0.39 |  |  | $ | 0.66 |

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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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