Taxes Taxes (Schedule of Components Of Income Tax) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Taxes [Abstract]
Current Federal Tax Expense (Benefit)	$ (20,022)	$ (20,164)	$ 34,304
Current State and Local Tax Expense (Benefit)	575	1,212	2,283
Current Income Tax Expense (Benefit)	(19,447)	(18,952)	36,587
Deferred Federal Income Tax Expense (Benefit)	(322,104)	13,214	(18,506)
Deferred State and Local Income Tax Expense (Benefit)	7,834	(1,851)	(367)
Deferred Income Tax Expense (Benefit)	(314,270)	11,363	(18,873)
Provision for (benefit from) income taxes	$ (333,717)	$ (7,589)	$ 17,714