| March 31 | For the years ended December 31 | |||||||||||||||||||||||
| dollars in thousands | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | ||||||||||||||||||
Fixed Charges | ||||||||||||||||||||||||
| Interest expense before capitalization credits | $ | 42,629 | $ | 182,456 | $ | 183,681 | $ | 185,176 | $ | 53,348 | $ | 31,310 | ||||||||||||
| Amortization of financing costs | 555 | 2,784 | 2,302 | 1,880 | 249 | 363 | ||||||||||||||||||
| One-third of rental expense | 6,026 | 24,134 | 26,237 | 30,800 | 27,358 | 27,240 | ||||||||||||||||||
| Total fixed charges | $ | 49,210 | $ | 209,374 | $ | 212,220 | $ | 217,856 | $ | 80,955 | $ | 58,913 | ||||||||||||
Earnings before income taxes as adjusted | ||||||||||||||||||||||||
| Earnings from continuing operations before income taxes | ($102,052 | ) | ($192,206 | ) | ($19,221 | ) | $ | 75,058 | $ | 667,502 | $ | 703,491 | ||||||||||||
| Minority interest in earnings (losses) of a consolidated subsidiary | 0 | 0 | 0 | (283 | ) | 151 | 0 | |||||||||||||||||
| Fixed charges | 49,210 | 209,374 | 212,220 | 217,856 | 80,955 | 58,913 | ||||||||||||||||||
| Capitalized interest credits | (516 | ) | (3,637 | ) | (10,721 | ) | (14,243 | ) | (5,130 | ) | (5,000 | ) | ||||||||||||
| Amortization of capitalized interest | 825 | 3,422 | 2,727 | 2,147 | 2,777 | 1,241 | ||||||||||||||||||
| Total earnings before income taxes as adjusted | ($52,533 | ) | $ | 16,953 | $ | 185,005 | $ | 280,535 | $ | 746,255 | $ | 758,645 | ||||||||||||
Ratio of earnings to fixed charges | — | 0.1 | 0.9 | 1.3 | 9.2 | 12.9 | ||||||||||||||||||
