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Significant Accounting Policies Basis of Presentation (Details) - USD ($)
3 Months Ended
Mar. 26, 2014
Mar. 31, 2014
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2007
Schedule of Equity Method Investments [Line Items]          
Investment percentage threshold     50.00%    
Equity method investment, ownership percentage     100.00%    
Accounts receivable, related parties     $ 1,920,000 $ 7,491,000  
Amounts guaranteed (not to exceed)     $ 210,703,000 300,557,000  
Brazilian Subsidiary [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage sold 51.00% 51.00%      
Equity method investment, ownership percentage 49.00%        
Zimbabwe [Member]          
Schedule of Equity Method Investments [Line Items]          
Cost method investments         $ 0
Amounts guaranteed (not to exceed)       $ 49,208,000