Six Months Ended June 30, | Year Ended December 31, | |||||||||||||||||||||||
| 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | |||||||||||||||||||
| Earnings: | ||||||||||||||||||||||||
| Income from continuing operations before income taxes | $ | 155,572 | $ | 297,181 | $ | 281,059 | $ | 250,753 | $ | 216,084 | $ | 235,949 | ||||||||||||
Interest expense (excluding capitalized interest)(1) | 10,935 | 36,529 | 38,301 | 46,847 | 47,797 | 44,165 | ||||||||||||||||||
| Portion of rent expense under long-term operating leases representative of an interest factor | 2,378 | 4,366 | 3,952 | 4,463 | 3,215 | 3,438 | ||||||||||||||||||
| Total earnings | $ | 168,885 | $ | 338,076 | $ | 323,312 | $ | 302,063 | $ | 267,096 | $ | 283,552 | ||||||||||||
| Fixed charges: | ||||||||||||||||||||||||
Interest expense (including capitalized interest)(1) | $ | 10,935 | $ | 36,529 | $ | 38,301 | $ | 46,847 | $ | 47,797 | $ | 44,165 | ||||||||||||
| Portion of rent expense under long-term operating leases representative of an interest factor | 2,378 | 4,366 | 3,952 | 4,463 | 3,215 | 3,438 | ||||||||||||||||||
| Total fixed charges | $ | 13,313 | $ | 40,895 | $ | 42,253 | $ | 51,310 | $ | 51,012 | $ | 47,603 | ||||||||||||
| Ratio of earnings to fixed charges | 12.7 | 8.3 | 7.7 | 5.9 | 5.2 | 6.0 | ||||||||||||||||||
