Shareholders' Equity (Details)			3 Months Ended		12 Months Ended
	Apr. 22, 2020	Apr. 20, 2020 $ / shares	Mar. 31, 2020 $ / shares shares	Mar. 31, 2019 $ / shares	Dec. 31, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares	Apr. 19, 2020 $ / shares
Common Shares
Reverse stock split ratio	50	50
Common shares, shares issued | shares			8,389,000		8,324,000
Common shares, par value (in dollars per share) | $ / shares		$ 0.05	$ 0.05		$ 0.05		$ 0.001
Dividends to common shareholders (in dollars per share) | $ / shares			$ 0.01	$ 0.01
Preferred stock, rate (as a percent)			6.00%		6.00%
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.001		$ 0.001
Preferred stock, liquidation preference (in dollars per share) | $ / shares			50		$ 50
Cash dividend per mandatory convertible preferred shares (in dollars per share) | $ / shares			$ 0.75	$ 0.75
Minimum
Common Shares
Reverse stock split ratio		15
Maximum
Common Shares
Reverse stock split ratio		50
Mandatory Convertible Preferred Shares
Common Shares
Preferred shares, shares issued | shares						5,750,000
Preferred stock, rate (as a percent)						6.00%
Preferred stock, par value (in dollars per share) | $ / shares						$ 0.001
Preferred stock, liquidation preference (in dollars per share) | $ / shares						$ 50
Shares repurchased | shares			4,900,000		5,600,000
Common Stock | Minimum
Common Shares
Conversion ratio | shares						0.1144
Common Stock | Maximum
Common Shares
Conversion ratio | shares						0.1372
Common Stock | Mandatory Convertible Preferred Shares
Common Shares
Number of consecutive trading days to calculate average share price of common stock						20 days
Common Stock | Mandatory Convertible Preferred Shares | Minimum
Common Shares
Conversion ratio | shares						0.1075
Common Stock | Mandatory Convertible Preferred Shares | Maximum
Common Shares
Conversion ratio | shares						0.1290