Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Income Tax Contingency [Line Items]
Valuation allowance	$ 54.0
Net of federal benefit	$ 43.0
Percentage of limitation on use	80.00%
Deferred income tax payment period	2 years
Income tax refunds	$ 13.0	$ 1.0
Shareholder's Right Plan [Member]
Income Tax Contingency [Line Items]
Beneficial ownership	4.90%
Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Operating loss carryforward		2,200.0
Washington, Oregon, Idaho, And Montana [Member] | Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Operating loss carryforward		$ 1,000.0