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Fair Value Measurements (Summary Of Change In The Fair Values Of Financial Instruments Categorized As Level 3) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended |
|---|---|
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Mar. 31, 2015
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | |
| Balance, beginning of period | $ 3,040 |
| Realized and unrealized losses recognized in earnings, net | (1,347) |
| Realized and unrealized gains recognized in other comprehensive income, net | 1,450 |
| Purchases | 7,783 |
| Issuances | (1,656) |
| Ending balance | $ 9,270 |