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Repayment of secured notes payable (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Repayments of Secured Debt   $ 306,199 $ 156,888 $ 396,240
Loss on early extinguishment of debt   $ 47,570 $ 1,122 $ 3,451
Secured notes payable maturing on 4/1/20        
Debt Instrument [Line Items]        
Repayments of Secured Debt $ 106,700      
Stated interest rate (as a percent) 7.75%      
Loss on early extinguishment of debt $ (7,100)      
Secured notes payable maturing on 1/28/20        
Debt Instrument [Line Items]        
Repayments of Secured Debt $ 193,100      
Stated interest rate (as a percent) 3.29%      
Loss on early extinguishment of debt $ (269)      
LIBOR | Secured notes payable maturing on 1/28/20        
Debt Instrument [Line Items]        
Applicable margin (as a percent) 1.50%