Earnings (Loss) per Share

We include restricted stock units for which no future service is required as a condition to the delivery of the underlying common stock in our calculation of weighted average shares outstanding. As we incurred a net loss for the year ended December 31, 2011, diluted loss per share for this period is computed on the same basis as basic loss per share, as the inclusion of any other potential shares outstanding would be anti-dilutive. Reconciliations of the amounts used in the basic and diluted earnings (loss) per common share computations for the years ended December 31, 2013, 2012 and 2011, are as follows (shares in thousands):



	2013	2012	2011
Diluted weighted average shares calculation:
Weighted average shares outstanding (basic)	440,666	467,752	485,381
Share-based awards	4,107	3,591	—
Weighted average shares outstanding (diluted)	444,773	471,343	485,381

We excluded the following items from diluted earnings (loss) per common share for the years ended December 31, 2013, 2012 and 2011, because they were anti-dilutive (shares in thousands):



	2013	2012	2011
Share-based awards	5,062	10,302	15,260