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Long-Term Borrowings, Capital Lease Obligations and License Agreements (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Long-Term Borrowings and Capital Lease Obligations        
Outstanding debt and capital lease obligations repaid $ 415,788 $ 618,598    
Current portion of long-term borrowings (Note 4) $ 562,550     $ 48,040
2.375% Senior Notes due June 2018        
Long-Term Borrowings and Capital Lease Obligations        
Current portion of long-term borrowings (Note 4)     $ 550,000