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]
Balance at Dec. 31, 2010	$ 177,533	$ 251	$ 177,275	$ 7
Balance, Shares at Dec. 31, 2010		25,061,072
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,335			3,335
Amortization of stock based compensation	2,478		2,478
Stock issuance, Value	547	0	547
Stock issuance, Shares		77,176
Common dividends	(8,051)			(8,051)
Balance at Jun. 30, 2011	175,842	251	180,300	(4,709)
Balance, Shares at Jun. 30, 2011		25,138,248
Balance at Dec. 31, 2011	326,573	369	344,995	(18,791)
Balance, Shares at Dec. 31, 2011	36,891,712	36,891,712
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,328			10,328
Amortization of stock based compensation	4,135		4,135
Stock issuance, Value	144	2	142
Stock issuance, Shares		159,530
Common dividends	(24,755)			(24,755)
Balance at Jun. 30, 2012	$ 316,425	$ 371	$ 349,272	$ (33,218)
Balance, Shares at Jun. 30, 2012	37,051,242	37,051,242