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Financial Instruments - Reconciliation of liabilities arising from financing activities (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
Bank Loans [Member]  
Reconciliation of liabilities arising from financing activities  
As of beginning of period $ 591,579
Financing cash flows 93,157
Amortization 3,206
As of end of period 687,942
Convertible Senior Notes [Member]  
Reconciliation of liabilities arising from financing activities  
As of beginning of period 109,916
Repurchase convertible notes (17,104)
Amortization 4,170
Equity component of convertible notes 2,213
Other Changes (932)
As of end of period 98,262
Total Liabilities [Member]  
Reconciliation of liabilities arising from financing activities  
As of beginning of period 701,495
Repurchase convertible notes (17,104)
Financing cash flows 93,157
Amortization 7,375
Equity component of convertible notes 2,213
Other Changes (932)
As of end of period $ 786,204