The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

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, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net income	$ (20,956)us-gaap_NetIncomeLoss	$ 31,296us-gaap_NetIncomeLoss	$ 94,960us-gaap_NetIncomeLoss	$ 72,649us-gaap_NetIncomeLoss	$ 15,376us-gaap_NetIncomeLoss	$ 39,570us-gaap_NetIncomeLoss	$ (9,264)us-gaap_NetIncomeLoss	$ 66,461us-gaap_NetIncomeLoss	$ 177,949us-gaap_NetIncomeLoss	$ 112,143us-gaap_NetIncomeLoss	$ 116,911us-gaap_NetIncomeLoss
Other comprehensive income, before tax:
Gains on hedging instrument									0	0	0
Other comprehensive income, before tax									0	0	0
Income tax expense related to gains on hedging instrument									0	0	0
Other comprehensive income, net of tax:									0	0	0
Comprehensive income									177,949us-gaap_ComprehensiveIncomeNetOfTax	112,143us-gaap_ComprehensiveIncomeNetOfTax	116,911us-gaap_ComprehensiveIncomeNetOfTax
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income									177,949	112,143	116,911
Other comprehensive income, before tax:
Gains on hedging instrument									0	0	0
Other comprehensive income, before tax									0	0	0
Income tax expense related to gains on hedging instrument									0	0	0
Other comprehensive income, net of tax:									0	0	0
Comprehensive income									$ 177,949	$ 112,143	$ 116,911