Accumulated Other Comprehensive Income (Reclassification out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss on investments, net	$ (156)	$ (7)	$ (20,991)	$ (45)
Income tax expense	24,330	$ 6,998	49,011	$ 17,851
Net Income	0		698
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss on investments, net	0		698
Income before income taxes	0		698
Income tax expense	$ 0		$ 0