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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