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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
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Out-of-period adjustments |  |  |  |  |  |  |  |  |  |  |
Gross profit | $ 102,698 | $ 119,885 | $ 123,525 | $ 100,156 | $ 94,966 | $ 113,475 | $ 111,487 | $ 92,523 | $ 446,264 | $ 412,450 | $ 358,919
Income from operations | $ 24,705 | $ 46,696 | $ 45,137 | $ 22,629 | $ 26,136 | $ 45,777 | $ 40,924 | $ 26,641 | 139,167 | 139,477 | 109,021
Net income |  |  |  |  |  |  |  |  | $ 92,617 | $ 89,734 | $ 67,888

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