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Basis of Presentation Schedule of Error Corrections and Prior Period Adjustment - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Gross profit | $ 98,318 | $ 95,917 |  | $ 175,816 |  | $ 173,680
Income from operations | 35,009 | 32,133 |  | 51,286 |  | 51,738
Net income | $ 21,509 | $ 20,451 |  | $ 31,560 | $ 30,993 | $ 32,538
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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