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Consolidated Statements Of Cash Flows (Parenthetical) |  |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Dec. 31, 2009 | Jun. 30, 2012 Capital Notes, 6%, Due 4/1/2012 [Member] | Dec. 31, 2011 Capital Notes, 6%, Due 4/1/2012 [Member] | Jun. 30, 2012 Capital Notes, 6%, Due 4/1/2017 [Member] | Dec. 31, 2011 Capital Notes, 6%, Due 4/1/2017 [Member]
Senior capital notes, interest rate | 6.00% | 6.00% | 6.00% | 6.00% | 6.00% | 6.00%
Senior capital notes, maturity date |  |  | Apr. 01, 2012 | Apr. 01, 2012 | Apr. 01, 2017 | Apr. 01, 2017

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