XML 13 R74.htm IDEA: XBRL DOCUMENT v3.19.3
Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments (Details) - Interest rate swaps - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Derivative labilities $ (40,400) $ 8,500
Variation margin 61,100 8,500
Derivative assets   1,800
Trading    
Derivative [Line Items]    
Derivative assets $ 20,673 $ 10,263