CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
CONSOLIDATED BALANCE SHEETS (Parenthetical) [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	400,000,000	200,000,000
Common stock, shares issued (in shares)	189,466,395	130,155,012
Common stock, shares outstanding (in shares)	187,037,994	127,726,611
Common stock, unvested restricted shares (in shares)	3,552,143	3,372,937
Treasury stock, shares (in shares)	2,428,401	2,428,401