Equity Transactions (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended		3 Months Ended		6 Months Ended
	May 15, 2019	May 14, 2019	May 31, 2014	Mar. 31, 2018	Dec. 31, 2012	Jun. 30, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)						2,000,000.0
Preferred stock, par value (in dollars per share)						$ 0.0001
Preferred stock, shares issued (in shares)			500,000		1,000,000.0
Shares of preferred stock, undesignated and unissued (in shares)						500,000
Document Period End Date						Jun. 30, 2019
Series A Preferred Stock | Private Offering
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)					1,000,000.0
Dividend rate on preferred stock					7.00%
Annual rate of preferred stock, per share (in dollars per share)				$ 12.26
Preferred stock, number of consecutive trading days required for stock conversion				20 days
Preferred stock, total number of trading days in stock conversion agreement				30 days
Common Stock Issued During Period, Shares, Conversion of Convertible Preferred Stock				10,599,974
Preferred stock dividends, total declared and paid				$ 7.0
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)						500,000	500,000
Preferred stock, par value (in dollars per share)						$ 0.0001	$ 0.0001
Preferred stock, shares issued (in shares)						500,000	500,000
Preferred stock, shares outstanding (in shares)						0	497,000
Series B Preferred Stock | Private Offering
Class of Stock [Line Items]
Annual rate of preferred stock, per share (in dollars per share)		$ 11.21
Preferred stock, number of consecutive trading days required for stock conversion	20 days
Preferred stock, total number of trading days in stock conversion agreement	30 days
Common Stock Issued During Period, Shares, Conversion of Convertible Preferred Stock						16,627,632
Preferred stock dividends, total declared and paid						$ 8.4
Series B Preferred Stock | Public Offering [Member]
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)			500,000
Dividend rate on preferred stock			6.75%
Employee [Member] | Public Offering [Member]
Class of Stock [Line Items]
Document Period End Date						Jun. 30, 2019