Annual report pursuant to Section 13 and 15(d)

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

v3.19.1
Stockholders' Equity Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Equity [Abstract]    
Unrealized gains $ 498,744 $ 475,694
Unrealized losses (387,927) (140,881)
Accumulated other comprehensive (loss) income $ 110,817 $ 334,813