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Basis of Presentation and Significant Accounting Policies - Adjustments Made to the Consolidated Balance Sheet Following Adoption (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Contract assets | $ 28,253 | $ 29,759 | $ 0
Inventories, net | 147,186 | 138,759 | 162,589
Prepaid expenses and other current assets | 14,312 | 11,513 | 11,687
Deferred income tax assets | 7,152 | 7,811 | 7,913
Liabilities and Stockholders' Equity |  |  |
Accounts payable and other current liabilities | 296,256 | 334,463 | 332,935
Deferred income tax liabilities | 1,530 | 4,443 | 4,423
Retained earnings | 292,936 | 270,864 | 266,780
As reported |  |  |
Assets |  |  |
Contract assets | 0 |  | 0
Inventories, net | 169,855 |  | 162,589
Prepaid expenses and other current assets | 14,307 |  | 11,687
Deferred income tax assets | 7,250 |  | 7,913
Liabilities and Stockholders' Equity |  |  |
Accounts payable and other current liabilities | 294,484 |  | 332,935
Deferred income tax liabilities |  |  | 4,423
Retained earnings | 289,217 |  | $ 266,780
ASU 2014-09 | Adjustments due to Adoption of ASU 2014-09 |  |  |
Assets |  |  |
Contract assets | 28,253 | 29,759 |
Inventories, net | (22,669) | (23,830) |
Prepaid expenses and other current assets | 5 | (174) |
Deferred income tax assets | (98) | (102) |
Liabilities and Stockholders' Equity |  |  |
Accounts payable and other current liabilities | 1,772 | 1,528 |
Deferred income tax liabilities |  | 20 |
Retained earnings | $ 3,719 | $ 4,084 |

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