Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Current federal (expense) benefit	$ 0	$ (272)	$ 811
Current state (expense) benefit	(176)	(353)	(3)
Current (expense) benefit	(176)	(625)	808
Deferred federal (expense) benefit	(155)	399	(1,597)
Deferred state (expense) benefit	(68)	29	142
Deferred (expense) benefit	$ (223)	$ 428	$ (1,455)