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
Jun. 30, 2019
Dec. 31, 2018
Equity [Abstract]    
Unrealized gains $ 819,396 $ 498,744
Unrealized losses (41,878) (387,927)
Accumulated other comprehensive income $ 777,518 $ 110,817