Formation and Organization (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	52 Months Ended
	May 13, 2013	Mar. 31, 2013	Dec. 31, 2012	Mar. 04, 2009
Authorized shares of common stock and preferred stock
Common stock, shares authorized		400,000,000	400,000,000
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Preferred stock, shares authorized		50,000,000	50,000,000
Preferred stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common stock filed in a registration statement with SEC, for issuance pursuant to primary offering (in shares)				100,000,000
Common stock filed in a registration statement with SEC, for issuance pursuant to DRP (in shares)				10,526,315
Gross proceeds from offering including proceeds from the Merger Transaction	$ 928.1
Subsequent event
Authorized shares of common stock and preferred stock
Shares remaining available for sale under Primary Offering	11,900,000
Shares remaining available for sale under DRP	8,300,000
Minimum
Authorized shares of common stock and preferred stock
Common stock filed in a registration statement with SEC, for issuance pursuant to offering (in shares)				200,000
Maximum
Authorized shares of common stock and preferred stock
Common stock filed in a registration statement with SEC, for issuance pursuant to offering (in shares)				110,526,315