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Debt - Two Thousand Sixteen Credit Facility - Additional Information (Details) - USD ($)
1 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Sep. 07, 2016
Dec. 20, 2011
Debt Instrument [Line Items]        
Borrowing capacity under Credit Facility       $ 600,000,000
2016 Credit Facility | Revolving Credit Facility | Lender        
Debt Instrument [Line Items]        
Borrowing capacity under Credit Facility     $ 73,000,000  
Basis spread on variable rate   1.50%    
Credit Facility, description   The Company may borrow from the 2016 Credit Facility in U.S dollars only and we may voluntarily repay any outstanding borrowing at any time without premium or penalty. Any overdue amounts under or in respect of the 2016 Credit Facility not paid when due shall bear interest in the case of principal at the applicable interest rate plus 1.50% per annum    
Amount borrowed $ 73,000,000      
Borrowings, interest rate 1.70% 1.70%    
2016 Credit Facility | Revolving Credit Facility | Minimum | Lender        
Debt Instrument [Line Items]        
Repayment term of borrowings   1 month    
2016 Credit Facility | Revolving Credit Facility | Maximum | Lender        
Debt Instrument [Line Items]        
Repayment term of borrowings   6 months    
2016 Credit Facility | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Lender        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.125%    
Borrowings, interest rate description   bear interest at LIBOR plus 112.5 basis points