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Debt Facilities - U.S. Financing (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2014
Jun. 30, 2012
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 08, 2015
Dec. 17, 2014
Debt Instrument [Line Items]                
Loss on debt extinguishment       $ 12,276,000 $ 289,000 $ 156,990,000    
Revolving credit facility borrowings | LIBOR                
Debt Instrument [Line Items]                
Margin rate (percent)   1.00%            
Revolving credit facility borrowings | Minimum                
Debt Instrument [Line Items]                
Quarterly facility fee (percent)   0.30%            
Revolving credit facility borrowings | Maximum                
Debt Instrument [Line Items]                
Quarterly facility fee (percent)   0.40%            
Revolving credit facility borrowings | U.S. Term Loan                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 200,000,000            
Repayment of debt $ 110,000,000              
Revolving credit facility borrowings | U.S. Term Loan | Federal Funds Rate                
Debt Instrument [Line Items]                
Variable rate (percent)   0.50%            
Revolving credit facility borrowings | U.S. Term Loan | Minimum | LIBOR                
Debt Instrument [Line Items]                
Variable rate (percent)   1.25%            
Revolving credit facility borrowings | U.S. Term Loan | Minimum | Base Rate                
Debt Instrument [Line Items]                
Variable rate (percent)   0.25%            
Revolving credit facility borrowings | U.S. Term Loan | Maximum | LIBOR                
Debt Instrument [Line Items]                
Variable rate (percent)   2.00%            
Revolving credit facility borrowings | U.S. Term Loan | Maximum | Base Rate                
Debt Instrument [Line Items]                
Variable rate (percent)   1.00%            
Revolving credit facility borrowings | Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 550,000,000         $ 1,500,000,000 $ 1,000,000,000
Repayment of debt     $ 331,357,000 $ 0 $ 20,000,000      
Loss on debt extinguishment $ 2,534,000              
Revolving credit facility borrowings | Revolving Credit Facility | Minimum | LIBOR                
Debt Instrument [Line Items]                
Variable rate (percent)   0.95%            
Revolving credit facility borrowings | Revolving Credit Facility | Minimum | Base Rate                
Debt Instrument [Line Items]                
Variable rate (percent)   0.00%            
Revolving credit facility borrowings | Revolving Credit Facility | Maximum | LIBOR                
Debt Instrument [Line Items]                
Variable rate (percent)   1.60%            
Revolving credit facility borrowings | Revolving Credit Facility | Maximum | Base Rate                
Debt Instrument [Line Items]                
Variable rate (percent)   0.60%            
Revolving credit facility borrowings | U.S. Financing                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 750,000,000