Consolidated Balance Sheets (Parenthetical)	Dec. 31, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Preference stock, shares authorized	5,000,000	5,000,000
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	51,081,878	51,589,405
Common stock, shares outstanding	51,081,878	51,589,405