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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

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