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Debt Facilities - U.S. Financing (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2014
Jun. 30, 2012
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 08, 2015
Dec. 17, 2014
Debt Instrument [Line Items]              
Loss on debt extinguishment     $ 289,000 $ 156,990,000 $ 108,501,000    
Line of Credit [Member] | LIBOR [Member]              
Debt Instrument [Line Items]              
Margin rate (percent)   1.00%          
Line of Credit [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Quarterly facility fee (percent)   0.30%          
Line of Credit [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Quarterly facility fee (percent)   0.40%          
Line of Credit [Member] | U.S. Term Loan [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 200,000,000          
Repayment of debt $ 110,000,000            
Line of Credit [Member] | U.S. Term Loan [Member] | Federal Funds Rate [Member]              
Debt Instrument [Line Items]              
Variable rate (percent)   0.50%          
Line of Credit [Member] | U.S. Term Loan [Member] | Minimum [Member] | LIBOR [Member]              
Debt Instrument [Line Items]              
Variable rate (percent)   1.25%          
Line of Credit [Member] | U.S. Term Loan [Member] | Minimum [Member] | Base Rate [Member]              
Debt Instrument [Line Items]              
Variable rate (percent)   0.25%          
Line of Credit [Member] | U.S. Term Loan [Member] | Maximum [Member] | LIBOR [Member]              
Debt Instrument [Line Items]              
Variable rate (percent)   2.00%          
Line of Credit [Member] | U.S. Term Loan [Member] | Maximum [Member] | Base Rate [Member]              
Debt Instrument [Line Items]              
Variable rate (percent)   1.00%          
Line of Credit [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 550,000,000       $ 1,500,000,000 $ 1,000,000,000
Repayment of debt     $ 20,000,000        
Loss on debt extinguishment $ 2,534,000            
Line of Credit [Member] | Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member]              
Debt Instrument [Line Items]              
Variable rate (percent)   0.95%          
Line of Credit [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member]              
Debt Instrument [Line Items]              
Variable rate (percent)   0.00%          
Line of Credit [Member] | Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member]              
Debt Instrument [Line Items]              
Variable rate (percent)   1.60%          
Line of Credit [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]              
Debt Instrument [Line Items]              
Variable rate (percent)   0.60%          
Line of Credit [Member] | U.S. Financing [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 750,000,000