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Debt - Long-term Debt (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2016
USD ($)
extension_option
May 31, 2014
extension_option
Sep. 30, 2016
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Feb. 29, 2016
USD ($)
Debt Instrument [Line Items]              
Asset-backed securitizations, net       $ 2,491,234,000 $ 2,530,210,000    
Secured note payable       49,828,000 50,752,000    
Revolving credit facilities       0 0    
Total debt       2,981,062,000 2,580,962,000    
Deferred financing costs, net       (51,636,000)      
Total debt per balance sheet       2,922,574,000 2,524,395,000    
Amortization of debt issuance costs       10,475,000 8,305,000 $ 1,767,000  
Term Loan Facility              
Debt Instrument [Line Items]              
Term loan facility       $ 321,735,000 0    
2014-SFR 1              
Debt Instrument [Line Items]              
Interest rate       2.31%      
Asset-backed securitizations, net       $ 456,074,000 473,755,000    
Debt instrument term   2 years          
Number of debt instrument extension options | extension_option   3          
Period of extension options   12 months          
2014-SFR 1 | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate   0.25%          
2014-SFR 2              
Debt Instrument [Line Items]              
Interest rate       4.42%      
Asset-backed securitizations, net       $ 501,810,000 507,305,000    
2014-SFR 3              
Debt Instrument [Line Items]              
Interest rate       4.40%      
Asset-backed securitizations, net       $ 517,827,000 523,109,000    
2015-SFR 1              
Debt Instrument [Line Items]              
Interest rate       4.14%      
Asset-backed securitizations, net       $ 543,480,000 549,121,000    
2015-SFR 2              
Debt Instrument [Line Items]              
Interest rate       4.36%      
Asset-backed securitizations, net       $ 472,043,000 476,920,000    
Secured note payable | Notes Payable              
Debt Instrument [Line Items]              
Interest rate       4.06%      
Secured note payable       $ 49,828,000 50,752,000    
Weighted Average | 2014-SFR 1 | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate   1.54%          
Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Interest rate       2.62%      
Revolving credit facilities       $ 0 0    
Credit facility maximum borrowing capacity $ 650,000,000.0            
Line of Credit | Revolving Credit Facility | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.85%        
Line of Credit | Minimum | Revolving Credit Facility | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate 1.75%            
Line of Credit | Minimum | Revolving Credit Facility | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.75%            
Line of Credit | Maximum | Revolving Credit Facility | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.30%            
Line of Credit | Maximum | Revolving Credit Facility | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate 1.30%            
Secured Debt              
Debt Instrument [Line Items]              
Amortization of debt issuance costs       $ 8,500,000 7,000,000    
Secured Debt | Term Loan Facility              
Debt Instrument [Line Items]              
Interest rate       2.57%      
Term loan facility       $ 325,000,000 0    
Deferred financing costs, net       $ (3,300,000)      
Number of debt instrument extension options | extension_option 2            
Credit facility maximum borrowing capacity $ 350,000,000.0            
Secured Debt | Term Loan Facility | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.80%        
Secured Debt | Minimum | Term Loan Facility | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate 1.70%            
Secured Debt | Minimum | Term Loan Facility | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.70%            
Secured Debt | Maximum | Term Loan Facility | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.30%            
Secured Debt | Maximum | Term Loan Facility | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate 1.30%            
Convertible Debt | 3.25% Exchangeable Senior Notes              
Debt Instrument [Line Items]              
Interest rate       3.25%     3.25%
Exchangeable senior notes       $ 115,000,000 0   $ 115,000,000.0
Unamortized discount on exchangeable senior notes       (1,883,000) 0   (2,700,000)
Equity component of exchangeable senior notes       $ (4,969,000) $ 0   $ (7,000,000)