Summary Of Quarterly Results Of Operations (Tables)

12 Months Ended

Dec. 31, 2011

Summary Of Quarterly Results Of Operations [Abstract]

Schedule Of Quarterly Results Of Operations

	Three Months Ended
	December 31, 2011			September 30, 2011			June 30, 2011			March 31, 2011
Investment Income—Interest Income	$	61,631		$	64,566		$	65,720		$	40,980
Total expenses		10,511			14,610			9,335			7,522
Net investment income		51,120			49,956			56,385			33,458
Net gain (loss) from investments		(8,588	)		120,959			129,225			19,820
Net gain (loss) from swap and cap contracts		1,561			(74,594	)		(86,188	)		(1,181	)
Net income	$	44,093		$	96,321		$	99,422		$	52,097
Net income per common share (diluted)	$	0.53		$	1.16		$	1.20		$	0.74

	Three Months Ended
	December 31, 2010			September 30, 2010			June 30, 2010			March 31, 2010
Investment Income—Interest Income	$	25,025		$	16,312		$	17,265		$	16,937
Total expenses		5,306			3,826			3,167			3,218
Net investment income		19,719			12,486			14,098			13,719
Net gain (loss) from investments		(66,125	)		28,577			32,367			6,464
Net gain (loss) from swap and cap contracts		29,138			(39,153	)		(18,860	)		(10,040	)
Net income (loss)	$	(17,268	)	$	1,910		$	27,605		$	10,143
Net income (loss) per common share (diluted)	$	(0.38	)	$	0.05		$	1.46		$	0.54