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Allowances (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Charge to increase allowance for doubtful accounts $ 6,079 $ 26,225 $ 12,087  
Allowance for doubtful accounts 48,138 49,364 32,392 $ 10,513
Accounts receivable, net 78,297 83,616    
China [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Charge to increase allowance for doubtful accounts 1,097 23,163 8,552  
Allowance for doubtful accounts 32,824 36,444 21,106 1,300
Accounts receivable, gross   41,600    
Accounts receivable, net   5,100    
Allowance for Doubtful Accounts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Charge to increase allowance for doubtful accounts 6,079 26,225 12,087  
Allowance for doubtful accounts 32,856 36,368 13,609 3,656
Allowance for Doubtful Accounts [Member] | China [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Charge to increase allowance for doubtful accounts 1,097 23,163 8,552  
Allowance for doubtful accounts $ 25,633 30,288 $ 8,440 $ 24
Past Due [Member] | China [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable, gross   $ 38,200