Stockholder's Equity (Preferred Stock Activity) (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shares
Beginning balance (in shares)	14,369,965	14,370,060	25,875,000
Shares redeemed (in shares)	0	0	(11,500,000)
Shares converted (in shares)	(14,369,965)	(95)	(4,940)
Ending balance (in shares)	0	14,369,965	14,370,060	25,875,000
Weighted Avg. Dividend Rate
Beginning balance	0.00%	6.50%	6.50%	6.50%
Shares redeemed	0.00%	0.00%	6.50%
Shares converted	6.50%	6.50%	6.50%
Ending balance	0.00%	6.50%	6.50%	6.50%