CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	72,440,407	70,491,732
Common stock, shares outstanding	71,650,849	69,957,055
Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	49,675,000	49,675,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Series A Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares issued	325,000	325,000
Preferred stock, shares outstanding	325,000	325,000
Preferred stock, liquidation value (in dollars per share)	$ 395,412	$ 387,808
Preferred stock, cumulative dividends (as a percent)	8.00%	8.00%