Fair Value Measurements (Summary Of Changes In Level 3 Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands | 3 Months Ended | 9 Months Ended | ||||||||
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Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | |||||||
| Fair Value Measurements [Abstract] | ||||||||||
| Derivatives, Beginning of Period | $ 24,596 | $ 28,397 | $ 25,228 | $ 26,968 | ||||||
| Total (gains) losses included in Net income | 3,319 | (1,445) | 2,687 | (16) | ||||||
| Total gains included in Other comprehensive income(loss) | 0 | 0 | 0 | 0 | ||||||
| Transfers into Level 3 | 0 | 0 | 0 | 0 | ||||||
| Transfers out of Level 3 | 0 | 0 | 0 | 0 | ||||||
| Derivatives, End of period | 27,915 | 26,952 | 27,915 | 26,952 | ||||||
| Net unrealized (gains) losses included in net income | $ 3,319 | [1] | $ (1,445) | [1] | $ 2,687 | [1] | $ (16) | [1] | ||
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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in investment income. Such unrealized (holding) gains or losses relate to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Transfers into liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Transfers out of liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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