Income Taxes (Reconciliation Of Income Tax At Effective Income Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income tax expense at federal statutory rate	$ (203,410)	$ (170,677)	$ (169,159)
State taxes, net of federal benefit	(14,517)	(9,616)	(11,308)
Differences between statutory rate and foreign effective tax rate	79,087	66,238	57,876
Reorganization Items	0	0	14,474
income tax benefit, related to worthless stock deduction	0	0	14,497
Change in valuation allowance	511	(434)	41,700
Accrual for uncertain tax positions	(963)	(706)	(22,719)
Other	(1,236)	2,781	4,530
Income tax (expense) benefit	$ 140,528	$ 112,414	$ 128,051