Income Taxes (Summary Of NOL, Credit Carryforwards, Valuation Allowance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax Credit Carryforward [Line Items]
Gross Deferred Tax Asset	$ 147,277	$ 141,984	$ 176,402
Valuation allowance	86,435	86,533	86,267
Total deferred tax assets	60,842	$ 55,451	$ 90,135
Non-Florida State NOLs [Member]
Tax Credit Carryforward [Line Items]
Federal and State NOL and Credit Carryforward	227,700
Gross Deferred Tax Asset	10,329
Valuation allowance	2,458
Total deferred tax assets	$ 7,871
Year Expires	2020-2039
Federal NOL SRLY Limitation [Member]
Tax Credit Carryforward [Line Items]
Federal and State NOL and Credit Carryforward	$ 227,595
Gross Deferred Tax Asset	47,795
Valuation allowance	$ 47,795
Year Expires	2026-2034
Florida NOL SRLY Limitation [Member]
Tax Credit Carryforward [Line Items]
Federal and State NOL and Credit Carryforward	$ 750,987
Gross Deferred Tax Asset	32,630
Valuation allowance	$ 32,630
Year Expires	2026-2034
Other Federal Tax Credits-SRLY Limitation [Member]
Tax Credit Carryforward [Line Items]
Federal and State NOL and Credit Carryforward	$ 2,372
Gross Deferred Tax Asset	2,372
Valuation allowance	$ 2,372
Year Expires	2025-2031
Federal NOL Section 382 Limitation [Member]
Tax Credit Carryforward [Line Items]
Federal and State NOL and Credit Carryforward	$ 7,885
Gross Deferred Tax Asset	1,656
Total deferred tax assets	$ 1,656
Year Expires	2023-2029
Florida NOL Section 382 Limitation [Member]
Tax Credit Carryforward [Line Items]
Federal and State NOL and Credit Carryforward	$ 5,127
Gross Deferred Tax Asset	209
Total deferred tax assets	$ 209
Year Expires	2024-2029
Canadian NOL [Member]
Tax Credit Carryforward [Line Items]
Federal and State NOL and Credit Carryforward	$ 3,919
Gross Deferred Tax Asset	794
Valuation allowance	$ 794
Year Expires	2033-2039
Canadian Capital Losses [Member]
Tax Credit Carryforward [Line Items]
Federal and State NOL and Credit Carryforward	$ 738
Gross Deferred Tax Asset	185
Valuation allowance	$ 185
Year Expires	Do not expire
Federal And State NOL And Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Gross Deferred Tax Asset	$ 95,970
Valuation allowance	86,234
Total deferred tax assets	$ 9,736