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Accounts Receivable (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Accounts receivable balances on product sales from different countries    
Current balance included within accounts receivable, net $ 1,018,487,000 $ 824,406,000
Spain [Member]
    
Accounts receivable balances on product sales from different countries    
Current balance included within accounts receivable, net 47,300,000 113,300,000
Non-current balance included within investments and other assets 8,100,000 6,800,000
Total 55,400,000 120,100,000
Italy [Member]
    
Accounts receivable balances on product sales from different countries    
Current balance included within accounts receivable, net 82,300,000 76,100,000
Non-current balance included within investments and other assets 900,000 2,400,000
Total 83,200,000 78,500,000
Portugal [Member]
    
Accounts receivable balances on product sales from different countries    
Current balance included within accounts receivable, net 10,400,000 10,400,000
Non-current balance included within investments and other assets 11,100,000 8,200,000
Total $ 21,500,000 $ 18,600,000