|
Fair Value Measurements (Summary Of Financial Assets And Liabilities Accounted For At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Assets: | ||
| Investments in marketable securities | $ 253,473 | $ 254,099 |
| Derivatives | 18,856 | 13,557 |
| Total assets | 272,329 | |
| Liabilities: | ||
| Derivatives | 1,010 | |
| Level 1 [Member] | ||
| Assets: | ||
| Investments in marketable securities | 3,955 | |
| Derivatives | 7,130 | |
| Total assets | 11,085 | |
| Level 2 [Member] | ||
| Assets: | ||
| Investments in marketable securities | 249,518 | |
| Derivatives | 2,456 | |
| Total assets | 251,974 | |
| Liabilities: | ||
| Derivatives | 1,010 | |
| Level 3 [Member] | ||
| Assets: | ||
| Derivatives | 9,270 | |
| Total assets | 9,270 | |
| Liabilities: | ||
| Derivatives | $ 0 |