Investments (Schedule Of Held-To-Maturity Securities) (Details) $ in Thousands |
Jun. 30, 2018
USD ($)
|
|---|---|
| Schedule of Held-to-maturity Securities [Line Items] | |
| Estimated Fair Value | $ 42,433 |
| Estimated Fair Value | 42,433 |
| Corporate Bonds [Member] | |
| Schedule of Held-to-maturity Securities [Line Items] | |
| Estimated Fair Value | 27,502 |
| Estimated Fair Value | 27,502 |
| U.S. Treasuries [Member] | |
| Schedule of Held-to-maturity Securities [Line Items] | |
| Estimated Fair Value | 14,931 |
| Estimated Fair Value | $ 14,931 |
| X | ||||||||||
- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Fair value of investments in debt securities classified as held-to-maturity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|