Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Preferred stock par value	$ 0.01	$ 0.01
Preferred stock authorized	2,000,000	2,000,000
Preferred stock issued	0	0
Common stock par value	$ 0.01	$ 0.01
Common stock authorized	206,000,000	206,000,000
Common stock issued	78,286,465	72,846,144
Common stock outstanding	78,286,465	72,846,144