Income Taxes Reconciliation of Statutory Federal Income Tax Rate and Effective Tax Rate Footnotes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Federal statutory income tax rate	21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount			$ 36.2
Disallowed officer compensation	$ 6.1
Share based compensation shortfalls	4.0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	19.0
Operating Loss Carryforwards		$ 75.7
Alternative minimum tax	37.1	126.0
Deferred Tax Assets, Tax Credit Carryforwards		$ 50.3
Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 25.3