Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity Schedule of Accumulated Other Comprehensive Income (Loss) (Details)

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Stockholders' Equity Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Equity [Abstract]    
Unrealized gains $ 505,389 $ 730,043
Unrealized losses (14,059) (40,643)
Accumulated other comprehensive income $ 491,330 $ 689,400