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Basis of Presentation and Significant Accounting Policies - Condensed Balance Sheet, Pro Forma Amounts Under Previous Guidance (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Contract assets | $ 22,269 | $ 29,759 | $ 0
Inventories, net | 139,408 | 138,759 | 162,589
Prepaid expenses and other current assets | 12,229 | 11,513 | 11,687
Deferred income taxes | 7,119 | 7,811 | 7,913
Liabilities and Stockholders' Equity |  |  |
Accounts payable and other current liabilities | 319,350 |  |
Deferred income taxes | 4,485 | 4,443 | 4,423
Retained earnings | 270,277 | 270,864 | $ 266,780
Without Adoption of ASU 2014-09 |  |  |
Assets |  |  |
Contract assets | 0 |  |
Inventories, net | 156,478 |  |
Prepaid expenses and other current assets | 12,313 |  |
Deferred income taxes | 7,141 |  |
Liabilities and Stockholders' Equity |  |  |
Accounts payable and other current liabilities | 317,921 |  |
Deferred income taxes | 4,359 |  |
Retained earnings | 266,739 |  |
Effect of Change | ASU 2014-09 |  |  |
Assets |  |  |
Contract assets | 22,269 | 29,759 |
Inventories, net | (17,070) | (23,830) |
Prepaid expenses and other current assets | (84) | (174) |
Deferred income taxes | (22) | (102) |
Liabilities and Stockholders' Equity |  |  |
Accounts payable and other current liabilities | 1,429 |  |
Deferred income taxes | 126 | 20 |
Retained earnings | $ 3,538 | $ 4,084 |

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