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Leases - Prepaid Leases (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
factory
Dec. 31, 2014
USD ($)
Operating Leased Assets [Line Items]    
Net book value of asset $ 90,015 $ 76,135
People's Republic of China [Member]    
Operating Leased Assets [Line Items]    
Number of factories | factory 2  
Guangzhou    
Operating Leased Assets [Line Items]    
Net book value of prepaid lease $ 1,200  
Prepaid lease assets, remaining amortization period 15 years  
Guangzhou | Buildings on Prepaid Land    
Operating Leased Assets [Line Items]    
Net book value of asset $ 12,400  
Asset, remaining depreciable period 16 years  
Yangzhou    
Operating Leased Assets [Line Items]    
Net book value of prepaid lease $ 2,700  
Prepaid lease assets, remaining amortization period 43 years  
Yangzhou | Buildings on Prepaid Land    
Operating Leased Assets [Line Items]    
Net book value of asset $ 22,300  
Asset, remaining depreciable period 24 years