Stockholders' Equity (Details Textual) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended
	Feb. 10, 2013	Mar. 31, 2013	Jun. 30, 2013	Jun. 19, 2013	Dec. 31, 2012
Stockholders' Equity (Textual) [Abstract]
Common stock, shares authorized			580,000,000		580,000,000
Common stock, par value			$ 0.01		$ 0.01
Preferred stock, shares authorized			20,000,000
Preferred stock, par value			$ 0.01
Proceeds from issuance of common stock			$ 132,300,000
Annualized rate		$ 475	$ 50
Percentage of annualized rate		4.75%	5.00%
Annualized rate per share		$ 10.00	$ 10.00
Period Of Distribution		365
Common Stock Reinvested			13,300,000
Preferred Stock, Dividend Rate, Percentage	3.00%
Aggregate Return Of Common Stock			7.50%
Stock value Registered Under Dividend Reinvestment Plan				99,000,000
Stock Issued During Period, Shares, Dividend Reinvestment Plan			0
Dividend Reinvestment Plan [Member]
Stockholders' Equity (Textual) [Abstract]
Sale of Stock, Price Per Share				$ 10.02
Sale Of Stock Price Per Share Percentage Of Estimated Per Share Value				100.00%
Kohlberg Kravis Roberts and Company [Member]
Stockholders' Equity (Textual) [Abstract]
Equity Commitment Value	150,000,000
Series A Preferred Stock [Member]
Stockholders' Equity (Textual) [Abstract]
Preferred stock, par value	$ 0.01
Percentage Of Senior Cumulative Preferred Stock	3.00%
Series B Preferred Stock [Member]
Stockholders' Equity (Textual) [Abstract]
Proceeds from Issuance of Private Placement	149,900,000
Senior Cumulative Preferred Stock Percentage	7.50%
Preferred Stock, Dividend Rate, Percentage			7.50%
Annual Rate Of Liquidation Preference			10.00%
Series C Preferred Stock [Member]
Stockholders' Equity (Textual) [Abstract]
Preferred stock, par value	$ 0.01
Proceeds from Issuance of Private Placement	$ 100,000
Senior Cumulative Preferred Stock Percentage	3.00%