Year Ended December 31,

2006

2005

2004

2003

2002

2001

Earnings:

Income from continuing operations before income taxes

$

142,541

$

250,734

$

316,873

$

299,380

$

340,722

$

297,534

Interest expense (excluding capitalized interest)

56,661

56,604

32,851

19,241

5,079

5,691

Portion of rent expense under long-term operating leases representative of an interest factor

3,675

4,799

4,929

2,478

3,058

3,540

Total earnings

$

202,877

$

312,137

$

354,653

$

321,099

$

348,859

$

306,765

Fixed charges:

Interest expense (including capitalized interest)

$

57,051

$

57,399

$

33,299

$

19,241

$

5,139

$

5,691

Portion of rent expense under long-term operating leases representative of an interest factor

3,675

4,799

4,929

2,478

3,058

3,540

Total fixed charges

$

60,726

$

62,198

$

38,228

$

21,719

$

8,197

$

9,231

Ratio of earnings to fixed charges

3.3

5.0

9.3

14.8

42.6

33.2