CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Total Company's Stockholders' Equity	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests
Balance at Dec. 31, 2011	$ 135,907	$ 135,903	$ 159	$ 138,968	$ (3,317)	$ 93	$ 4
Balance (in shares) at Dec. 31, 2011			15,847
Increase (Decrease) in Stockholders' Equity
Net proceeds from issuance of common stock	385,098	385,098	433	384,665
Net proceeds from issuance of common stock (in shares)	43,400,000		43,407,000
Proceeds from DRP	10,305	10,305	11	10,294
Proceeds from DRP (in shares)	1,100,000		1,085,000
Shares redeemed for cash	(1,371)	(1,371)	(1)	(1,370)
Shares redeemed for cash (in shares)	(100,000)		(142,000)
Issuance and amortization of equity-based compensation	60	60		60
Issuance and amortization of equity-based compensation (in shares)			8,000
Other comprehensive income (loss)	365	364				364	1
Distributions declared	(27,922)	(27,922)			(27,922)
Net income (loss)	15,304	15,304			15,304
Balance at Dec. 31, 2012	517,746	517,741	602	532,617	(15,935)	457	5
Balance (in shares) at Dec. 31, 2012			60,205
Increase (Decrease) in Stockholders' Equity
Net proceeds from issuance of common stock	155,581	155,581	174	155,407
Net proceeds from issuance of common stock (in shares)	17,400,000		17,398,000
Proceeds from DRP	5,242	5,242	6	5,236
Proceeds from DRP (in shares)	600,000		552,000
Shares redeemed for cash	(1,019)	(1,019)	(1)	(1,018)
Shares redeemed for cash (in shares)	(100,000)		(105,000)
Issuance and amortization of equity-based compensation	17	17		17
Other comprehensive income (loss)	945	945				945
Distributions declared	(13,464)	(13,464)			(13,464)
Net income (loss)	7,922	7,922			7,922
Balance at Mar. 31, 2013	$ 672,970	$ 672,965	$ 781	$ 692,259	$ (21,477)	$ 1,402	$ 5
Balance (in shares) at Mar. 31, 2013			78,050