Condensed Consolidated Statement of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Cumulative Distributions in Excess of Net Income [Member]	Preferred Stock [Member]	Preferred Stock [Member]	Preferred Stock [Member] Additional Paid-in Capital [Member]	Common Stock [Member]	Common Stock [Member] Additional Paid-in Capital [Member]
Balance at Dec. 31, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares outstanding		37,051,242
Net income	$ 15,554			$ 15,554
Amortization of stock based compensation	5,969		5,969
Stock issuance, Value	144	2	142
Stock issuance, Shares		159,530
Common dividends	(36,921)			(36,921)
Balance at Sep. 30, 2012	311,319	371	351,106	(40,158)
Balance at Dec. 31, 2012	305,488	371	353,861	(48,744)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares outstanding	37,333,943	37,333,943
Net income	20,716			20,716
Amortization of stock based compensation	5,693		5,693
Stock issuance, Value		2			58	138,257	138,199	(2,949)	(2,951)
Dividends, Preferred Stock, Cash				(5,406)
Stock issuance, Shares		234,734			5,750,000
Common dividends	(38,609)			(38,609)
Preferred stock, shares outstanding	5,750,000				5,750,000
Balance at Sep. 30, 2013	$ 423,190	$ 373	$ 494,802	$ (72,043)	$ 58