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Basis of Presentation and Significant Accounting Policies - Condensed Statements of Operations, Pro Forma Amounts Under Previous Guidance (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Net sales | $ 162,523 | $ 177,580 | $ 327,221 | $ 338,986
Cost of sales | 135,764 | 133,829 | 263,260 | 254,201
Selling, general and administrative expenses | 30,570 | 31,053 | 60,817 | 61,704
Provision for income taxes | 2,088 | 1,415 | 1,922 | 1,121
Net income | $ 22,659 | $ 4,684 | $ 22,072 | $ 4,803
Earnings per share: |  |  |  |
Basic (in dollars per share) | $ 1.61 | $ 0.33 | $ 1.57 | $ 0.33
Diluted (in dollars per share) | $ 1.60 | $ 0.32 | $ 1.55 | $ 0.33
Without Adoption of ASU 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Net sales | $ 156,133 |  | $ 328,321 |
Cost of sales | 129,745 |  | 264,001 |
Selling, general and administrative expenses | 30,427 |  | 60,837 |
Provision for income taxes | 2,040 |  | 1,895 |
Net income | $ 22,478 |  | $ 22,437 |
Earnings per share: |  |  |  |
Basic (in dollars per share) | $ 1.60 |  | $ 1.59 |
Diluted (in dollars per share) | $ 1.59 |  | $ 1.58 |
Effect of Change | ASU 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Net sales | $ 6,390 |  | $ (1,100) |
Cost of sales | 6,019 |  | (741) |
Selling, general and administrative expenses | 143 |  | (20) |
Provision for income taxes | 48 |  | 27 |
Net income | $ 181 |  | $ (365) |
Earnings per share: |  |  |  |
Basic (in dollars per share) | $ 0.01 |  | $ (0.03) |
Diluted (in dollars per share) | $ 0.01 |  | $ (0.03) |

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