Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 15, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 18, 2018
Class Of Stock [Line Items]
Preferred stock, shares authorized		12,500,000
Common stock repurchase, authorized				$ 30.0
Common stock repurchase, shares		2,050,000
Common stock repurchase, weighted average price per share		$ 3.34
Additional number of common stock shares repurchased				2,823,000
Additional common stock repurchased, weighted average price per share				$ 3.25
Subsequent Event [Member]
Class Of Stock [Line Items]
Dividends payable, date declared	Apr. 15, 2019
Common stock, dividends declared	$ 0.05
Dividends payable, date to be paid	May 20, 2019
Dividends payable, date of record	May 10, 2019
Series B [Member]
Class Of Stock [Line Items]
Preferred stock, shares authorized		1,450,000	1,450,000
Series B [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Preferred stock dividends declared	$ 0.453125
Series C [Member]
Class Of Stock [Line Items]
Preferred stock, shares authorized		6,450,000	6,450,000
Series C [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Preferred stock dividends declared	$ 0.406250