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Debt - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
property
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
property
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]                  
Payments on asset-backed securitizations             $ 15,669,000 $ 472,470,000  
Gain (loss) on early extinguishment of debt     $ 0   $ 0   (1,447,000) (6,555,000)  
Deferred financing costs, net     37,876,000       37,876,000   $ 38,026,000
Asset Backed Securitizations May 2014 Securitization                  
Debt Instrument [Line Items]                  
Payments on asset-backed securitizations           $ 455,400,000      
Asset Backed Securitizations May 2014 Securitization | Property disqualified from collateral pool | Single Family Homes                  
Debt Instrument [Line Items]                  
Number of properties released | property           3,799      
Increase (decrease) in cash collateral for borrowed securities           $ (9,400,000)      
Secured Debt | Asset Backed Securitizations May 2014 Securitization | Special Purpose Entity                  
Debt Instrument [Line Items]                  
Gain (loss) on early extinguishment of debt               (6,555,000)  
Secured Note Payable | Secured Debt                  
Debt Instrument [Line Items]                  
Payments on asset-backed securitizations       $ 48,400,000          
Gain (loss) on early extinguishment of debt       $ (500,000)          
Number of properties released | property       572          
Increase (decrease) in cash collateral for borrowed securities       $ (2,100,000)          
Term loan facility, net                  
Debt Instrument [Line Items]                  
Payments on credit facility             100,000,000 $ 100,000,000  
Term loan facility, net | Line of Credit                  
Debt Instrument [Line Items]                  
Payments on credit facility       100,000,000          
Write off of unamortized deferred financing costs       $ 900,000          
Deferred financing costs, net     $ 800,000       $ 800,000   $ 2,000,000
Effective interest rate     3.61%       3.61%    
4.25% Senior Notes Due 2028 | Senior Notes                  
Debt Instrument [Line Items]                  
Debt instrument face amount   $ 500,000,000              
Interest Rate   4.25% 4.25%       4.25%    
Net proceeds from debt issuance   $ 494,000,000              
Underwriting fees   3,200,000              
Unamortized discount   2,800,000              
Deferred financing costs, net   $ 1,900,000              
Effective interest rate     4.08%       4.08%    
3.25% Exchangeable Senior Notes | Convertible Debt                  
Debt Instrument [Line Items]                  
Interest Rate     3.25%       3.25%    
Convertible debt conversion ratio             0.0556688    
3.25% Exchangeable Senior Notes | Convertible Debt | American Residential Properties Inc.                  
Debt Instrument [Line Items]                  
Convertible debt conversion ratio 0.0469423                
Convertible debt conversion ratio adjustment 0.0532795                
Equity interest issued, number of shares, multiplier     1.135       1.135