Fair Value of Financial Instruments - Changes in Fair Value of Level 3 Financial Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Fair Value Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Balance as of	$ 15,912	$ 22,956
Total gains (losses) included in net income	(417)	(3,012)
Total gains (losses) included in other comprehensive income	(3,539)	(2,483)
Sales	(718)
Balance as of	11,238	17,461
Change in unrealized gains (losses) for the period included in net income for assets held at the end of the reporting period	(417)	(3,012)
Change in unrealized gains (losses) for the period included in other comprehensive income for assets held at the end of the reporting period	(3,539)	(2,483)
States and political subdivision bonds
Fair Value Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Balance as of	3,100	3,596
Total gains (losses) included in net income	0	0
Total gains (losses) included in other comprehensive income	(580)	(496)
Sales	0
Balance as of	2,520	3,100
Change in unrealized gains (losses) for the period included in other comprehensive income for assets held at the end of the reporting period	(580)	(496)
Corporate bonds
Fair Value Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Balance as of	8,328	11,767
Total gains (losses) included in net income	0	0
Total gains (losses) included in other comprehensive income	(2,959)	(1,987)
Sales	0
Balance as of	5,369	9,780
Change in unrealized gains (losses) for the period included in other comprehensive income for assets held at the end of the reporting period	(2,959)	(1,987)
Other investments
Fair Value Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Balance as of	4,484	7,593
Total gains (losses) included in net income	(417)	(3,012)
Total gains (losses) included in other comprehensive income	0	0
Sales	(718)
Balance as of	3,349	4,581
Change in unrealized gains (losses) for the period included in net income for assets held at the end of the reporting period	$ (417)	$ (3,012)

National General Holdings Corp. 10-Q