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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
Mar. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance, beginning of period $ 8,174
Realized and unrealized losses recognized in earnings, net (4,472)
Purchases 3,217
Issuances (25)
Settlements (1,252)
Ending balance $ 5,642