Income Taxes, Federal and State NOL Carryforwards (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2020	Dec. 31, 2019
NOL Carryforwards [Abstract]
Paid federal income taxes attributable to alternative minimum tax rate	$ 501
Alternative Minimum Tax (AMT) Credit Carryforward [Member]
NOL Carryforwards [Abstract]
Income tax refund received		$ 30	$ 30
Federal [Member]
NOL Carryforwards [Abstract]
Operating loss carryforwards, amount		$ 114,000
Tax year expiring		2026
Federal [Member] | Alternative Minimum Tax (AMT) Credit Carryforward [Member]
NOL Carryforwards [Abstract]
Income tax refund received		$ 10,700	$ 10,700
State [Member]
NOL Carryforwards [Abstract]
Operating loss carryforwards, amount		$ 227,000
Tax year expiring		2031