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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Tax loss carryforwards $ 238,082 $ 268,389
Purchase price allocation adjustment 24,437 30,855
Property and equipment, tax inflation 37,577 37,471
Other accrued payroll and other liabilities 30,730 15,437
Share-based compensation 3,850 4,151
Provision for contingencies 2,478 3,449
Other deferred tax assets 21,528 27,292
Other deferred tax liabilities (10,670) (13,649)
Property and equipment - difference in depreciation rates (12,639) (14,195)
Valuation allowance (271,651) (290,620)
Net deferred tax asset 63,722 68,580
Operating Loss Carryforwards [Line Items]    
Operating tax loss carryforwards 849,911  
Expire Between 2015 and 2019 [Member]    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 274,106  
Expire After 2019 [Member]    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 348,370  
No Expiration Period [Member]    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 227,435  
Venezuela [Member]    
Operating Loss Carryforwards [Line Items]    
Foreign currency translation adjustment related to Venezuela's foreign currency exchange differences 698 5,055
Puerto Rico [Member]    
Operating Loss Carryforwards [Line Items]    
Foreign currency translation adjustment related to Venezuela's foreign currency exchange differences $ 3,782 $ 3,832