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Summary of Significant Accounting Policies - Condensed Balance Sheet, Pro Forma Amounts Under Previous Guidance (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Contract assets | $ 25,572 | $ 29,759 | $ 0
Inventories, net | 144,350 | 138,759 | 162,589
Prepaid expenses and other current assets | 11,638 | 11,513 | 11,687
Deferred income taxes | 1,833 | 10,485 | 7,913
Accounts payable and other current liabilities | 279,856 | 337,035 | 332,935
Accumulated other comprehensive income (loss) | (20,281) |  | (16,599)
Retained earnings | 282,788 | 270,864 | 266,780
Without Adoption of ASU 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Contract assets | 0 |  | 0
Inventories, net | 164,974 |  | 162,589
Prepaid expenses and other current assets | 11,610 |  | 11,687
Deferred income taxes | 1,889 |  | 7,913
Accounts payable and other current liabilities | 278,106 |  | 332,935
Accumulated other comprehensive income (loss) | (19,750) |  |
Retained earnings | 279,087 |  | $ 266,780
Effect of Change | ASU 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Contract assets | 25,572 | 29,759 |
Inventories, net | (20,624) | (23,830) |
Prepaid expenses and other current assets | 28 | (174) |
Deferred income taxes | (56) | 2,572 |
Accounts payable and other current liabilities | 1,750 | 4,100 |
Accumulated other comprehensive income (loss) | (531) |  |
Retained earnings | $ 3,701 | $ 4,084 |

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