Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Tax Credit Carryforward [Line Items]
Increase in valuation allowance	$ 25,314
Deferred Tax Assets Tax Credit Carryforwards Domestic	49,937	$ 47,956
Deferred Tax Assets Tax Credit Carryforwards State And Local	7,750	9,369
Net operating loss carryforwards - Federal	27,935
Uncategorized Tax Benefits	51,596	51,558
Deferred Tax Assets, Valuation Allowance	33,337	$ 7,413
Reduction of the deferred asset associated with the federal tax credit carryforwards	40,800
Reasonably possible amount in unrecognized tax benefit that with be settled within the coming year	12,500
Begin To Expire In 2033 [Member]
Tax Credit Carryforward [Line Items]
Deferred Tax Assets Tax Credit Carryforwards Domestic	49,700
Begin To Expire In 2021 [Member]
Tax Credit Carryforward [Line Items]
Deferred Tax Assets Tax Credit Carryforwards State And Local	$ 7,800