XML 84 R70.htm IDEA: XBRL DOCUMENT v3.10.0.1
Debt - Preferred Equity Certificates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 24, 2018
Debt Instrument [Line Items]        
Preferred equity certificates $ 0 $ 253,324    
Interest expense related to financing $ 11,710 0 $ 0  
Preferred Equity Certificate        
Debt Instrument [Line Items]        
Debt instrument, interest rate 12.00%      
Interest expense related to financing $ 17,300 $ 25,900 $ 24,300  
Cabot        
Debt Instrument [Line Items]        
Preferred equity certificates       $ 262,500