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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Foreign currency transaction gain (loss), net $ 808 $ 226 $ (1,611)
Beginning balance     (796)
Foreign currency translation adjustments 14,198 (7,698) (11,542)
Change in fair value of derivative instruments (2,679) (567) 2,892
Amounts reclassified from accumulated other comprehensive loss to other income (expense) due to hedge instrument ineffectiveness     (576)
Income tax expense (benefit) on derivative instruments 594 (902) 0
Less: Comprehensive income attributable to non-controlling interest (163) 1,104 0
Accumulated other comprehensive loss (6,166) (18,466) (11,813)
Foreign Exchange Forward | Cost of Goods Sold      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income to cost of goods sold 187 1,500 (1,791)
Foreign Exchange Forward | Sales Revenue, Net      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income to cost of goods sold   1,014  
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 1,570 525 0
Foreign currency translation adjustments 0 0 0
Change in fair value of derivative instruments (2,679) (567) 2,892
Amounts reclassified from accumulated other comprehensive loss to other income (expense) due to hedge instrument ineffectiveness     (576)
Income tax expense (benefit) on derivative instruments 594 (902)  
Ending balance (328) 1,570 525
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Foreign Exchange Forward | Cost of Goods Sold      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income to cost of goods sold 187 1,500 (1,791)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Foreign Exchange Forward | Sales Revenue, Net      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income to cost of goods sold   1,014  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (20,036) (12,338) (796)
Foreign currency translation adjustments 14,198 (7,698) (11,542)
Change in fair value of derivative instruments 0 0 0
Amounts reclassified from accumulated other comprehensive loss to other income (expense) due to hedge instrument ineffectiveness     0
Income tax expense (benefit) on derivative instruments 0 0  
Ending balance (5,838) (20,036) (12,338)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] | Foreign Exchange Forward | Cost of Goods Sold      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income to cost of goods sold $ 0 0 $ 0
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] | Foreign Exchange Forward | Sales Revenue, Net      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income to cost of goods sold   $ 0