Capitalization (Details 4) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended						9 Months Ended
	Dec. 31, 2011	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011
Capitalization
Monthly declared distribution rate (in dollars per share)								$ 0.0083
Annual distribution rate on common stock (as a percent)	2.20%							1.00%
Price per share (in dollars per share)	$ 4.64	$ 10.00						$ 10.00
Distributions
Distributions declared and payable	$ 2,481	$ 2,493						$ 2,493
Distributions		7,476	7,830	7,450	7,426	7,418	7,401	22,756	22,245
Cash
Distributions
Distributions declared and payable		1,400						1,400
DRP
Distributions
Distributions declared and payable		1,100						1,100
Common stockholders | Cash
Distributions
Distributions		4,204	4,177	4,171	4,093	4,068	4,069	12,552	12,230
Common stockholders | DRP
Distributions
Distributions		3,261	3,275	3,268	3,321	3,336	3,320	9,804	9,977
Noncontrolling Interests
Distributions
Distributions		$ 11	$ 378	$ 11	$ 12	$ 14	$ 12	$ 400	$ 38