Income Taxes (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Income Tax Benefit From Worthless Stock Deduction			$ 33,200,000
Deferred Tax Assets Stock Basis Difference					23,900,000	9,300,000
Valuation Allowance				12,600,000
Reversal Of Valuation Allowance			9,300,000
Reversal Of Unrecognized Tax Benefits	1,000,000		1,000,000
Reversal Of Accrued Interest And Penalties	1,900,000		1,900,000
Provision (benefit) for income taxes	$ (28,013,000)	$ 25,116,000	$ 12,727,000	$ 67,487,000
Effective Income Tax Rate	(154.10%)		9.90%