| Consolidated Debt |
Consolidated debt at December 31, 2013 and June 30, 2014 was as follows (in thousands, except as otherwise noted): | | | | | | | | | | | | | | December 31, 2013 | | June 30,
2014 | | Weighted-Average Interest Rate for Six Months Ending June 30, 2014 (1) | Commercial paper(2) | | $ | — |
| | $ | 220,977 |
| | 0.3% | Revolving credit facility(2) | | — |
| | — |
| | 1.3% | $250.0 million of 6.45% Notes due 2014(2) | | 249,971 |
| | — |
| | 6.3% | $250.0 million of 5.65% Notes due 2016 | | 251,183 |
| | 250,970 |
| | 5.7% | $250.0 million of 6.40% Notes due 2018 | | 259,346 |
| | 258,313 |
| | 5.4% | $550.0 million of 6.55% Notes due 2019 | | 571,515 |
| | 569,704 |
| | 5.7% | $550.0 million of 4.25% Notes due 2021 | | 557,213 |
| | 556,763 |
| | 4.0% | $250.0 million of 6.40% Notes due 2037 | | 248,998 |
| | 249,007 |
| | 6.4% | $250.0 million of 4.20% Notes due 2042 | | 248,377 |
| | 248,391 |
| | 4.2% | $550.0 million of 5.15% Notes due 2043 | | 298,684 |
| | 556,371 |
| | 5.1% | Total debt | | $ | 2,685,287 |
| | $ | 2,910,496 |
| | 5.1% | | | | | | | |
| | (1) | Weighted-average interest rate includes the amortization/accretion of discounts, premiums and gains/losses realized on historical cash flow and fair value hedges in interest expense. |
| | (2) | These borrowings were outstanding for only a portion of the six month period ending June 30, 2014. The weighted-average interest rate for these borrowings was calculated based on the number of days the borrowings were outstanding during the noted period. |
|