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Operations and Summary of Significant Accounting Policies - Revisions and Out of Period Adjustments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Out-of-period adjustments |  |  |  |  |  |  |  |  |  |  |
Gross profit | $ 82,762 | $ 100,341 | $ 98,318 | $ 77,498 | $ 72,797 | $ 95,553 | $ 95,900 | $ 77,780 | $ 358,919 | $ 342,030 | $ 313,531
Income from operations | $ 22,485 | $ 35,249 | $ 35,009 | $ 16,277 | $ 15,320 | $ 32,218 | $ 32,133 | 19,605 | 109,021 | 99,276 | 81,478
Net income |  |  |  |  |  |  |  |  | $ 67,888 | $ 63,531 | $ 50,971
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
Out-of-period adjustments |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  | 2,300 |  |  |
Income from operations |  |  |  |  |  |  |  | 2,000 |  |  |
Net income |  |  |  |  |  |  |  | $ 1,300 |  |  |

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