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Selected Quarterly Financial Data - Unaudited (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Data - Unaudited [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
|  | Quarter Ended
|  | Mar. 31 |  | Jun. 30 |  | Sept. 30 |  | Dec. 31
|  | (in thousands except per share data)
2017 |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ | 247,739 |  |  | $ | 331,514 |  |  | $ | 343,236 |  |  | $ | 370,124 |
Gross profit |  | $ | 88,945 |  |  | $ | 88,062 |  |  | $ | 111,598 |  |  | $ | 137,490 |
Net income (loss) |  | $ | 55,863 |  |  | $ | (37,060 | ) |  | $ | 136 |  |  | $ | 49,705 |
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 3.03 |  |  | $ | (1.87 | ) |  | $ | 0.01 |  |  | $ | 2.47 |
Diluted |  | $ | 2.86 |  |  | $ | (1.87 | ) |  | $ | 0.01 |  |  | $ | 2.33 |
2016 |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ | 89,855 |  |  | $ | 96,721 |  |  | $ | 97,108 |  |  | $ | 95,688 |
Gross profit |  | $ | 49,233 |  |  | $ | 50,132 |  |  | $ | 51,273 |  |  | $ | 50,760 |
Net income |  | $ | 18,160 |  |  | $ | 16,606 |  |  | $ | 18,806 |  |  | $ | 9,512 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.13 |  |  | $ | 1.03 |  |  | $ | 1.16 |  |  | $ | 0.58 |
Diluted |  | $ | 1.08 |  |  | $ | 0.98 |  |  | $ | 1.09 |  |  | $ | 0.54 |
______________________________________ On February 3, 2017, we acquired HIS, see Note 2, Acquisitions, Strategic Transaction and Integration Costs.

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- Definition Quarterly Financial Data - Unaudited [Abstract] + References No definition available. + Details
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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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