CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, 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		43,407
Proceeds from distribution reinvestment plan	10,305	10,305	11	10,294
Proceeds from distribution reinvestment plan (in shares)	1,100		1,085
Shares redeemed for cash	(1,371)	(1,371)	(1)	(1,370)
Shares redeemed for cash (in shares)	(100)		(142)
Issuance and amortization of equity-based compensation	60	60		60
Issuance and amortization of equity-based compensation (in shares)			8
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	460,769	460,769	515	460,254
Net proceeds from issuance of common stock (in shares)	51,500		51,475
Proceeds from distribution reinvestment plan	12,509	12,509	13	12,496
Proceeds from distribution reinvestment plan (in shares)	1,300		1,317
Shares redeemed for cash	(2,675)	(2,675)	(3)	(2,672)
Shares redeemed for cash (in shares)	(300)		(281)
Issuance and amortization of equity-based compensation	36	36		36
Issuance and amortization of equity-based compensation (in shares)			11
Other comprehensive income (loss)	1,987	1,987				1,987
Distributions declared	(32,329)	(32,329)			(32,329)
Net income (loss)	20,879	20,879			20,879
Balance at Jun. 30, 2013	$ 978,922	$ 978,917	$ 1,127	$ 1,002,731	$ (27,385)	$ 2,444	$ 5
Balance (in shares) at Jun. 30, 2013			112,727