Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Narrative (Details)

Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		151 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Apr. 30, 2019
Capital Unit [Line Items]
Shares authorized for repurchase (in shares) (up to)						37,500,000
Repurchase and retirement of common stock	$ 526	$ 5,318	$ 10,873	$ 8,746
Restricted stock units forfeited (in shares)	0		82,500
Non-cash compensation expense	$ 1,536	1,380	$ 4,474	$ 4,442
Shares surrendered for tax withholdings (in shares)			1,002,460	247,379
Preferred stock issued, net of underwriting discount and expense	(18)	(91)	$ 9,431	$ (180)
Preferred stock dividends declared and paid	8,702	8,507	25,987	25,523
Common stock dividends declared and paid	$ 1,793	2,448	$ 5,380	6,377
Common Stock
Capital Unit [Line Items]
Repurchase and retirement of common stock (in shares)	155,571		2,041,958		27,226,063
Repurchase and retirement of common stock	$ 526		$ 7,078		$ 73,194
Shares available for purchase (in shares)	10,273,937		10,273,937		10,273,937
Common stock cash dividend (in dollars per share)	$ 0.0125		$ 0.0125
Common stock dividends declared and paid	$ 1,793		$ 5,380
Series A Preferred Stock
Capital Unit [Line Items]
Preferred stock issued, net of underwriting discount and expense (in shares)	0		389,207.000
Preferred stock issued, net of underwriting discount and expense	$ 18		$ 9,431
Preferred stock dividends declared and paid	8,702		$ 25,987
Dividends paid per share on monthly basis (in dollars per share)			$ 0.1667
Employees
Capital Unit [Line Items]
Stock-based compensation	1,536	1,373	$ 4,459	4,408
Consultants and Independent Financial Advisors
Capital Unit [Line Items]
Stock-based compensation	0	$ 7	15	$ 34
Options
Capital Unit [Line Items]
Unrecognized compensation cost for stock based compensation	$ 56		$ 56		$ 56
Unrecognized compensation cost for stock based compensation, period of recognition			1 month 75 days
Purchase of shares (in shares)	444,481		3,193,408
Intrinsic value of options exercised	$ 583		$ 6,917
Restricted shares
Capital Unit [Line Items]
Unrecognized compensation cost for stock based compensation	12,363		$ 12,363		12,363
Unrecognized compensation cost for stock based compensation, period of recognition			2 years 6 months 66 days
Restricted shares \| Employees
Capital Unit [Line Items]
Non-cash compensation expense	1,536		$ 4,459
Restricted shares \| Awards Granted In 2019
Capital Unit [Line Items]
Unrecognized compensation cost for stock based compensation	$ 7,431		$ 7,431		$ 7,431
Unrecognized compensation cost for stock based compensation, period of recognition			3 years 1 month 27 days
Options, Warrants, and Other
Capital Unit [Line Items]
Shares surrendered for tax withholdings (in shares)	0		1,002,460