Basis of Presentation and Significant Accounting Policies Basis of Presentation and Significant Accounting Policies - Preferred Stock and Dividends (Details) - $ / shares	1 Months Ended
	May 31, 2017	Jun. 30, 2017	Sep. 30, 2016
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		500,000	500,000
Preferred stock, issued (in shares)		0	0
9% Cumulative Voting Convertible Preferred Stock, Series A
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)		830
Preferred stock, shares authorized (in shares)	1,000
Preferred stock liquidation preference, par value (usd per share)	$ 1,000
Preferred stock dividend rate	9.00%
Preferred stock, issued (in shares)		830
Common Stock
Class of Stock [Line Items]
Conversion ratio	0.00423