Income Taxes (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Entity Information [Line Items]
Effective Income Tax Rate Reconciliation, at Combined Federal and State Statutory Income Tax Rate, Percent			22.50%
Estimated annual effective income tax rate			2.60%
Effective Income Tax Rate Reconciliation, Including Discontinued Operations, Percent	69.20%	50.00%	2.80%	37.20%
Subsidiaries [Member]
Entity Information [Line Items]
Effective income tax rates		(14.80%)		(3.90%)
Effective Income Tax Rate Reconciliation, at Combined Federal and State Statutory Income Tax Rate, Percent			22.50%
Effective Income Tax Rate Reconciliation, Including Discontinued Operations, Percent	5.50%		12.10%