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Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Statements Of Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]                      
Net income $ (17,382) $ 66,201 $ (5,264) $ 73,356 $ 79,469 $ (3,782) $ 57,251 $ 58,226 $ 116,911 $ 191,164 $ 152,198
Gains (losses) on hedging instrument                 0 1,139 (220)
Other comprehensive income (loss), before tax                 0 1,139 (220)
Income tax expense (benefit) related to gains (losses) on hedging instrument                 0 399 (77)
Other comprehensive income (loss), net of tax:                 0 740 (143)
Comprehensive income                 116,911 191,904 152,055
Parent Company [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Net income                 116,911 191,164 152,198
Gains (losses) on hedging instrument                 0 1,139 (220)
Other comprehensive income (loss), before tax                 0 1,139 (220)
Income tax expense (benefit) related to gains (losses) on hedging instrument                 0 399 (77)
Other comprehensive income (loss), net of tax:                 0 740 (143)
Comprehensive income                 $ 116,911 $ 191,904 $ 152,055