Selected Quarterly Information (Unaudited) (Notes)

12 Months Ended

Dec. 31, 2015

Selected Quarterly Information (Unaudited) [Abstract]

Quarterly Financial Information [Text Block]

SELECTED QUARTERLY INFORMATION (UNAUDITED)

	Year Ended December 31, 2015
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Operating results:
Interest income	$	24,099		$	24,527		$	26,096		$	25,522
Interest expense	5,371			5,542			5,859			5,833
Net interest income	18,728			18,985			20,237			19,689
(Loss) gain on derivatives instruments, net	(25,323		)	17,090			(52,749		)	17,854
Gain (loss) on sale of investments, net	1,308			(1,491		)	113			(908		)
Fair value adjustments and other income (expense) amounts, net	72			632			(199		)	174
General and administrative expenses	(4,257		)	(4,754		)	(4,379		)	(4,278		)
Preferred stock dividends	(2,294		)	(2,294		)	(2,294		)	(2,294		)
Net (loss) income to common shareholders	(11,766		)	28,168			(39,271		)	30,237
Other comprehensive income (loss)	23,054			(39,679		)	27,418			(44,877		)
Comprehensive income (loss) to common shareholders	$	11,288		$	(11,511	)	$	(11,853	)	$	(14,640	)
Net (loss) income per common share	$	(0.21	)	$	0.52		$	(0.74	)	$	0.61
Dividends declared per common share	$	0.24		$	0.24		$	0.24		$	0.24

	Year Ended December 31, 2014
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Operating results:
Interest income	$	27,640		$	27,718		$	26,000		$	24,286
Interest expense	7,633			6,572			6,058			5,652
Net interest income	20,007			21,146			19,942			18,634
(Loss) gain on derivatives instruments, net	(13,422		)	(23,074		)	4,842			(21,739		)
(Loss) gain on sale of investments, net	(3,307		)	(477		)	9,057			10,950
Fair value adjustments and other income (expense) amounts, net	107			225			939			(17		)
General and administrative expenses	(4,119		)	(3,819		)	(3,914		)	(4,155		)
Preferred stock dividends	(2,294		)	(2,294		)	(2,294		)	(2,294		)
Net (loss) income to common shareholders	(3,028		)	(8,293		)	28,572			1,379
Other comprehensive income (loss)	29,560			35,199			(14,482		)	4,855
Comprehensive income to common shareholders	$	26,532		$	26,906		$	14,090		$	6,234
Net (loss) income per common share	$	(0.06	)	$	(0.15	)	$	0.52		$	0.03
Dividends declared per common share	$	0.25		$	0.25		$	0.25		$	0.25