Quarter Ended
September 30

Nine Months Ended
September 30

2011

2010

2011

2010

Basic earnings per common share

Numerator for basic earnings per common share:

Net income

$

41,003

$

23,673

$

118,236

$

93,869

Series A and B preferred share dividends

(5,105

)

(5,058

)

(15,223

)

(15,175

)

Unvested stock award participation in earnings

(148

)

(104

)

(434

)

(437

)

$

35,750

$

18,511

$

102,579

$

78,257

Denominator for basic earnings per common share:

Weighted average common shares outstanding

84,147

70,129

77,852

69,879

Average unvested stock awards outstanding

(465

)

(393

)

(461

)

(389

)

83,682

69,736

77,391

69,490

$

0.43

$

0.27

$

1.33

$

1.13

Diluted earnings per common share

Numerator for diluted earnings per common share:

Net income

$

41,003

$

23,673

$

118,236

$

93,869

Dividends on antidilutive convertible preferred shares

(5,031

)

(4,983

)

(14,999

)

(14,949

)

Unvested stock award participation in earnings

(148

)

(104

)

(434

)

(437

)

$

35,824

$

18,586

$

102,803

$

78,483

Denominator for diluted earnings per common share:

Weighted average common shares outstanding

84,147

70,129

77,852

69,879

Average unvested stock awards outstanding

(465

)

(393

)

(461

)

(389

)

Net effect of dilutive stock and option awards

77

34

74

39

Net effect of dilutive convertible preferred shares

309

310

309

310

84,068

70,080

77,774

69,839

$

0.43

$

0.27

$

1.32

$

1.12