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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation adjustments $ (7,672,000) $ 14,361,000 $ (8,831,000)  
Foreign currency transaction gain (loss), net (2,824,000) 808,000 226,000  
Foreign currency translation adjustments (7,969,000) 14,198,000 (7,698,000)  
Net Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion) 389,000 (2,679,000) (567,000)  
Income tax expense (benefit) on derivative instruments 282,000 594,000 (902,000)  
Less: Comprehensive income attributable to non-controlling interest (297,000) (163,000) 1,104,000  
Accumulated other comprehensive loss (13,700,000) (6,166,000) (18,466,000) $ (11,813,000)
Equity adjustment from derivative instruments, net of tax 435,000 (1,898,000) 1,074,000  
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 (236,000) 187,000 1,500,000  
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     1,014,000  
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation adjustments (7,969,000) 14,198,000 (7,727,000)  
Equity adjustment from derivative instruments, net of tax 435,000 (1,898,000) 1,074,000  
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (328,000) 1,570,000 525,000  
Foreign currency translation adjustments 0 0 0  
Net Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion) 389,000 (2,679,000) (567,000)  
Income tax expense (benefit) on derivative instruments 282,000 594,000 (902,000)  
Ending balance 107,000 (328,000) 1,570,000  
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 (236,000) 187,000 1,500,000  
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     1,014,000  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (5,838,000) (20,036,000) (12,338,000)  
Foreign currency translation adjustments (7,969,000) 14,198,000 (7,698,000)  
Net Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion) 0 0 0  
Income tax expense (benefit) on derivative instruments 0 0 0  
Ending balance (13,807,000) (5,838,000) (20,036,000)  
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