Three months ended
June 30,

Six months ended
June 30,

2011

2010

2011

2010

(in thousands, except per common share results)

Net income available for common stockholders

$

460,287

$

340,076

$

775,463

$

598,844

Weighted average outstanding shares of common stock used to compute basic earnings per common share

167,021

168,472

167,146

168,336

Dilutive effect of:

Employee stock options

1,073

533

996

566

Restricted stock

1,466

1,224

1,405

1,252

Shares used to compute diluted earnings per common share

169,560

170,229

169,547

170,154

Basic earnings per common share

$

2.76

$

2.02

$

4.64

$

3.56

Diluted earnings per common share

$

2.71

$

2.00

$

4.57

$

3.52

Number of antidilutive stock options and restricted stock excluded from computation

139

4,770

1,441

4,904