Income Tax (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)	$ (3,513)	$ 0	$ 0
Income (loss) from operations, before provision for income taxes	20,122	24,635	(14,880)
Estimated tax effect of claimed deductions	$ 2,200
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		3,700	69,600
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		$ 14,900	$ 36,700