Quarterly report pursuant to Section 13 or 15(d)

Available-for-Sale Securities, at Fair Value Schedule of Realized Gain (Loss) (Details)

v3.8.0.1
Available-for-Sale Securities, at Fair Value Schedule of Realized Gain (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds $ 634,299 $ 2,791,697 $ 5,727,024 $ 6,567,991
Available-for-sale Securities, Gross Realized Gains (Losses), Amortized Cost Sold 638,233 2,759,919 5,748,016 6,504,642
Gross realized gains 408 31,942 57,133 77,836
Gross realized losses (4,342) (164) (78,125) (14,487)
Total realized (losses) gains on sales, net $ (3,934) $ 31,778 $ (20,992) $ 63,349