Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal income tax (benefit)	$ (1,795)	$ 523	$ 356
State and local income tax (benefit)	57	47	169
Net current tax provision (benefit)	(1,738)	570	525
Deferred:
Federal income tax (benefit)	8,776	(9,739)	1,167
State and local income tax (benefit)	1,346	(1,383)	(306)
Net deferred tax provision (benefit)	10,122	(11,122)	861
Total income tax provision (benefit)	$ 8,384	$ (10,552)	$ 1,386