Numerator:

Numerator for basic and diluted earnings per share – Net income available to common shareholders

$

66,690

$

79,132

$

199,450

$

229,401

Denominator:

Denominator for basic earnings per share – weighted average shares outstanding

78,235

79,216

78,759

78,878

Effect of dilutive securities– Employee and director stock options and restricted share awards

2,358

2,668

2,408

2,729

Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions

80,593

81,884

81,167

81,607

Basic earnings per common share

$

0.85

$

1.00

$

2.53

$

2.91

Diluted earnings per common share and common share equivalents

$

0.83

$

0.97

$

2.46

$

2.81