CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	132,349,534	132,349,534
Common stock, shares outstanding	96,254,818	95,909,948
Treasury stock, shares	36,094,716	36,439,586