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]
Net income	$ 4,405			$ 4,405
Amortization of stock based compensation	2,203		2,203
Stock issuance, Value	(370)	1	(371)
Stock issuance, Shares		117,890
Common dividends	(12,213)			(12,213)
Balance at Mar. 31, 2012	320,598	370	346,827	(26,599)
Balance, Shares at Mar. 31, 2012		37,009,602
Balance at Dec. 31, 2012	305,488	371	353,861	(48,744)
Balance, Shares at Dec. 31, 2012	37,099,209	37,099,209
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,557			9,557
Amortization of stock based compensation	2,569		2,569
Stock issuance, Value		2			58	138,376	138,318	(2,735)	(2,737)
Dividends, Preferred Stock, Cash	304			(304)
Stock issuance, Shares		234,734			5,750,000
Common dividends	(12,811)			(12,811)
Preferred stock, shares outstanding	5,750,000				5,750,000
Balance at Mar. 31, 2013	$ 440,140	$ 373	$ 492,011	$ (52,302)	$ 58
Balance, Shares at Mar. 31, 2013	37,333,943	37,333,943