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Debt - Components of Debt (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2016
USD ($)
extension_option
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
extension_option
Sep. 30, 2015
USD ($)
Feb. 29, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2013
USD ($)
Mar. 31, 2013
USD ($)
Debt Instrument [Line Items]                  
Asset-backed securitizations, gross   $ 2,498,318,000   $ 2,498,318,000     $ 2,530,210,000    
Secured note payable   50,065,000   50,065,000     50,752,000    
Revolving credit facilities   75,000,000   75,000,000     0    
Debt, gross   2,988,383,000   2,988,383,000     2,580,962,000    
Deferred financing costs, net   (53,845,000)   (53,845,000)     (56,567,000)    
Debt outstanding, net   2,926,821,000   2,926,821,000     2,524,395,000    
Amortization of financing costs       7,912,000 $ 5,769,000        
Delayed Draw Term Loan Facility                  
Debt Instrument [Line Items]                  
Secured debt outstanding   $ 246,575,000   $ 246,575,000     0    
2014-SFR 1                  
Debt Instrument [Line Items]                  
Interest rate   2.07%   2.07%          
Asset-backed securitizations, gross   $ 457,979,000   $ 457,979,000     473,755,000    
Debt instrument initial term       2 years          
Number of extension options | extension_option       3          
Period of extension options       12 months          
2014-SFR 1 | LIBOR                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate       0.25%          
2014-SFR 2                  
Debt Instrument [Line Items]                  
Interest rate   4.42%   4.42%          
Asset-backed securitizations, gross   $ 503,093,000   $ 503,093,000     507,305,000    
2014-SFR 3                  
Debt Instrument [Line Items]                  
Interest rate   4.40%   4.40%          
Asset-backed securitizations, gross   $ 519,148,000   $ 519,148,000     523,109,000    
2015-SFR 1                  
Debt Instrument [Line Items]                  
Interest rate   4.14%   4.14%          
Asset-backed securitizations, gross   $ 544,861,000   $ 544,861,000     549,121,000    
2015-SFR 2                  
Debt Instrument [Line Items]                  
Interest rate   4.36%   4.36%          
Asset-backed securitizations, gross   $ 473,237,000   $ 473,237,000     476,920,000    
Secured Notes Payable | Note Payable                  
Debt Instrument [Line Items]                  
Interest rate   4.06%   4.06%          
Secured note payable   $ 50,065,000   $ 50,065,000     50,752,000    
Senior Secured Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Interest rate   2.38%   2.38%          
Revolving credit facilities   $ 75,000,000   $ 75,000,000     0    
Credit facility amount, maximum (up to)   650,000,000   $ 650,000,000       $ 800,000,000 $ 500,000,000
Weighted blended interest rate | 2014-SFR 1 | LIBOR                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate       1.54%          
Line of Credit                  
Debt Instrument [Line Items]                  
Amortization of financing costs   500,000 $ 600,000 $ 1,900,000 1,800,000        
Line of Credit | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Revolving credit facilities   75,000,000   $ 75,000,000          
Credit facility amount, maximum (up to) $ 650,000,000.0                
Line of Credit | Revolving Credit Facility | LIBOR                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate       1.85%          
Line of Credit | Minimum | Revolving Credit Facility | LIBOR                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 1.75%                
Line of Credit | Minimum | Revolving Credit Facility | Base Rate                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 0.75%                
Line of Credit | Maximum | Revolving Credit Facility | LIBOR                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 2.30%                
Line of Credit | Maximum | Revolving Credit Facility | Base Rate                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 1.30%                
Secured Debt                  
Debt Instrument [Line Items]                  
Amortization of financing costs   $ 2,200,000 $ 1,800,000 $ 6,300,000 $ 5,000,000        
Secured Debt | Delayed Draw Term Loan Facility                  
Debt Instrument [Line Items]                  
Interest rate   2.33%   2.33%          
Secured debt outstanding   $ 250,000,000   $ 250,000,000          
Debt, gross             0    
Deferred financing costs, net   $ (3,400,000)   $ (3,400,000)          
Number of extension options | extension_option 2                
Credit facility amount, maximum (up to) $ 350,000,000.0                
Secured Debt | Delayed Draw Term Loan Facility | LIBOR                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate       1.80%          
Secured Debt | Minimum | Delayed Draw Term Loan Facility | LIBOR                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 1.70%                
Secured Debt | Minimum | Delayed Draw Term Loan Facility | Base Rate                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 0.70%                
Secured Debt | Maximum | Delayed Draw Term Loan Facility | LIBOR                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 2.30%                
Secured Debt | Maximum | Delayed Draw Term Loan Facility | Base Rate                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 1.30%                
Convertible Debt | 3.25% Exchangeable Senior Notes                  
Debt Instrument [Line Items]                  
Interest rate   3.25%   3.25%   3.25%      
Exchangeable senior notes   $ 115,000,000   $ 115,000,000   $ 115,000,000.0 0    
Unamortized discount   (2,134,000)   (2,134,000)   (2,700,000) 0    
Convertible instrument carrying amount   $ (5,583,000)   $ (5,583,000)   $ (7,000,000) $ 0