CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Preferred Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2012	$ 322,006	$ 496	$ 0	$ 355,006	$ (51,584)	$ 18,088
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	68,955				68,955
Stock issuances, net	101,104	145		100,959
Preferred Stock issuance, net	72,397		72,397
Dividends declared on common stock	(65,213)			(51,410)	(13,803)
Dividends declared on preferred stock	(3,568)				(3,568)
Reclassification adjustment for net gain included in net income	0
(Decrease) increase in net unrealized gain on available for sale securities	(18,800)					(18,800)
Increase (decrease) in fair value of derivative instruments utilized for cash flow hedges	3,785					3,785
Ending balance at Dec. 31, 2013	480,666	641	72,397	404,555	0	3,073
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	136,191				136,191
Stock issuances, net	297,726	410		297,316
Dividends declared on common stock	(97,786)				(97,786)
Dividends declared on preferred stock	(5,812)				(5,812)
Reclassification adjustment for net gain included in net income	(13,033)					(13,033)
(Decrease) increase in net unrealized gain on available for sale securities	20,881					20,881
Increase (decrease) in fair value of derivative instruments utilized for cash flow hedges	(906)					(906)
Ending balance at Dec. 31, 2014	817,927	1,051	72,397	701,871	32,593	10,015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	78,013				78,013
Stock issuances, net	119,644	43	86,862	32,739
Dividends declared on common stock	(111,199)				(111,199)
Dividends declared on preferred stock	(10,990)				(10,990)
Reclassification adjustment for net gain included in net income	(9,063)					(9,063)
(Decrease) increase in net unrealized gain on available for sale securities	(2,975)					(2,975)
Increase (decrease) in fair value of derivative instruments utilized for cash flow hedges	(831)					(831)
Ending balance at Dec. 31, 2015	$ 880,526	$ 1,094	$ 159,259	$ 734,610	$ (11,583)	$ (2,854)