Basis of Presentation and Significant Accounting Policies Basis of Presentation and Significant Accounting Policies - Preferred Stock and Dividends (Details) - USD ($) $ / shares in Units, $ in Millions					1 Months Ended	3 Months Ended
	Nov. 15, 2018	Aug. 23, 2018	Jun. 08, 2018	May 17, 2018	May 31, 2017	Dec. 31, 2018	Sep. 30, 2018	May 31, 2018	Sep. 01, 2017	Aug. 31, 2017
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)						500,000	500,000
Preferred stock, issued (in shares)						0	0
Debt conversion, amount of original debt				$ 1.0
9% Cumulative Voting Convertible Preferred Stock, Series A
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)					1,000				2,500	1,500
Preferred stock liquidation preference, par value (usd per share)					$ 1,000
Preferred stock dividend rate						9.00%
Preferred stock, shares outstanding (in shares)						2,012	2,678
9% Preferred Stock, Series A, Voting, Cumulative, Convertible
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)						4,500	4,500	4,500
Preferred Stock, Additional Shares Authorized								2,000
Preferred stock dividend rate					9.00%
Conversion price (usd per share)						$ 4.23
Preferred stock, issued (in shares)						2,012	2,678
Shares issued upon conversion (in shares)				1,902
Shares converted (in shares)	718	717	905
Common Stock
Class of Stock [Line Items]
Shares issued upon conversion (in shares)	169,741	169,485	213,437