Fair Value Measurements (Assets Measured At Fair Value) (Details) (USD $) | Mar. 31, 2014 | Dec. 31, 2013 |
In Thousands, unless otherwise specified |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | $46,559 | | $23,763 | |
Mutual Funds [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | 2,485 | | 2,485 | |
U.S. Government And Agency Securities [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | 1,757 | | 2,233 | |
Corporate Obligations [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | 32,576 | | 14,159 | |
Other Fixed Income Securities [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | 626 | | 361 | |
International Securities [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | 7,641 | | 3,048 | |
Municipal Obligations [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | 1,474 | | 1,477 | |
Quoted Market Prices in Active Markets for Identical Assets (Level 1) [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | 2,485 | | 2,485 | |
Quoted Market Prices in Active Markets for Identical Assets (Level 1) [Member] | Mutual Funds [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | 2,485 | | 2,485 | |
Significant Other Observable Inputs (Level 2) [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | 44,074 | | 21,278 | |
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government And Agency Securities [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | 1,757 | | 2,233 | |
Significant Other Observable Inputs (Level 2) [Member] | Corporate Obligations [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | 32,576 | [1] | 14,159 | [1] |
Significant Other Observable Inputs (Level 2) [Member] | Corporate Obligations [Member] | Line of Credit [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | 4,500 | | 4,500 | |
Significant Other Observable Inputs (Level 2) [Member] | Other Fixed Income Securities [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | 626 | | 361 | |
Significant Other Observable Inputs (Level 2) [Member] | International Securities [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | 7,641 | | 3,048 | |
Significant Other Observable Inputs (Level 2) [Member] | Municipal Obligations [Member] | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | |
Short-term investments | $1,474 | | $1,477 | |
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[1] | Included in this amount is a corporate obligation of $4.5 million as of MarchB 31, 2014 and December 31, 2013. This corporate obligation has been used to collateralize the Company's line of credit with Bank of America, and is included in the line item "Restricted cash and investments," a component of current assets, on the consolidated balance sheets. See Note 6, Credit Facilities, for further details. |