Annual report pursuant to Section 13 and 15(d)

Available-for-Sale Securities, at Fair Value Schedule of Unrealized Loss on Investments (Details)

v3.19.3.a.u2
Available-for-Sale Securities, at Fair Value Schedule of Unrealized Loss on Investments (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
position
Dec. 31, 2018
USD ($)
position
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Number of Positions | position 1,237 1,550
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | position 122 290
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | position 151 489
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 3,970,743 $ 4,386,946
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (25,061) (66,520)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 735,727 9,501,123
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (62,932) (370,082)
Debt Securities, Available-for-sale, Unrealized Loss Position 4,706,470 13,888,069
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (87,993) $ (436,602)