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Basis of Presentation Schedule of Error Corrections and Prior Period Adjustment - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Gross profit | $ 100,341 |  | $ 95,553 |  | $ 276,157 | $ 269,233
Income from operations | 35,249 |  | 32,218 |  | 86,535 | 83,956
Net income | $ 21,595 | $ 10,380 | $ 20,614 |  | $ 53,156 | $ 53,151
Restatement Adjustment |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Gross profit |  |  |  | $ 2,300 |  |
Income from operations |  |  |  | 2,000 |  |
Net income |  |  |  | $ 1,300 |  |

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