|
Debt (Details 2) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Carrying amount and estimated fair value of debt | ||
| Debt, net | $ 2,418,078 | $ 2,426,303 |
|
4.25% Exchangeable Senior Notes
|
||
| Carrying amount and estimated fair value of debt | ||
| Debt, net | 228,175 | 227,283 |
|
Carrying Amount
|
||
| Carrying amount and estimated fair value of debt | ||
| Variable- rate debt | 1,135,621 | 1,141,549 |
| Debt, net | 2,418,078 | 2,426,303 |
|
Carrying Amount | 4.25% Exchangeable Senior Notes
|
||
| Carrying amount and estimated fair value of debt | ||
| Fixed-rate debt | 228,175 | 227,283 |
|
Carrying Amount | Other fixed-rate debt
|
||
| Carrying amount and estimated fair value of debt | ||
| Fixed-rate debt | 1,054,282 | 1,057,471 |
|
Total Estimated Fair Value
|
||
| Carrying amount and estimated fair value of debt | ||
| Variable- rate debt | 1,135,847 | 1,139,856 |
| Debt, net | 2,424,288 | 2,432,357 |
|
Total Estimated Fair Value | 4.25% Exchangeable Senior Notes
|
||
| Carrying amount and estimated fair value of debt | ||
| Fixed-rate debt | 239,331 | 238,077 |
|
Total Estimated Fair Value | Other fixed-rate debt
|
||
| Carrying amount and estimated fair value of debt | ||
| Fixed-rate debt | $ 1,049,110 | $ 1,054,424 |