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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Tax loss carryforwards $ 254,861 $ 258,046
Purchase price allocation adjustment 37,549 57,786
Property and equipment, tax inflation 45,650 53,172
Other accrued payroll and other liabilities 13,891 14,328
Share-based compensation 3,570 5,266
Provision for contingencies 2,177 2,700
Other deferred tax assets 27,642 40,777
Other deferred tax liabilities (9,618) (10,781)
Property and equipment - difference in depreciation rates (12,411) (32,850)
Valuation allowance (297,891) (301,012)
Net deferred tax asset 65,420 87,432
Operating Loss Carryforwards [Line Items]    
Operating tax loss carryforwards 937,989  
Foreign currency translation adjustment related to Venezuela's foreign currency exchange differences 11,745 $ 26,361
Expire Between 2015 and 2019 [Member]    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 328,559  
Expire After 2019 [Member]    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 190,238  
No Expiration Period [Member]    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards $ 419,192