Income Taxes (Reconciliation Of Income Tax Provision (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accrued Income Taxes [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Federal income taxes (benefit) provision at statutory rate of 35%	$ (417,333)	$ 42,234	$ 7,772
Goodwill	0	0	16,382
Adjustments to the valuation allowance	459,843	(64,757)	(28,865)
Non-deductible compensation	2,399	3,409	1,328
State taxes net of federal benefit	(45,009)	3,464	3,239
State tax rate change	0	15,496	0
Other	100	154	144
Total income tax (benefit)	$ 0	$ 0	$ 0