Fair Value Measurements (Assets Measured At Fair Value) (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014 |
In Thousands, unless otherwise specified |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | $27,968 | $36,816 |
Fixed income mutual fund | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | 2,492 | 2,492 |
U.S. government and agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | 1,313 | 951 |
Corporate obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | 12,018 | 22,145 |
Other fixed income securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | 871 | 491 |
International securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | 11,274 | 10,311 |
Municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | | 426 |
Quoted Market Prices in Active Markets for Identical Assets (Level 1) | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | 2,492 | 2,492 |
Quoted Market Prices in Active Markets for Identical Assets (Level 1) | Fixed income mutual fund | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | 2,492 | 2,492 |
Significant Other Observable Inputs (Level 2) | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | 25,476 | 34,324 |
Significant Other Observable Inputs (Level 2) | U.S. government and agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | 1,313 | 951 |
Significant Other Observable Inputs (Level 2) | Corporate obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | 12,018 | 22,145 |
Significant Other Observable Inputs (Level 2) | Other fixed income securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | 871 | 491 |
Significant Other Observable Inputs (Level 2) | International securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | 11,274 | 10,311 |
Significant Other Observable Inputs (Level 2) | Municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions | | |
Short-term investments | | $426 |