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Summary of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 USD ($) | Dec. 31, 2015 USD ($) ARS / $ BRL / $ | Mar. 31, 2016 USD ($) $ / shares ARS / $ VEF / $ BRL / $ | Dec. 31, 2015 USD ($) ARS / $ BRL / $ | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) ARS / $ BRL / $ | Dec. 31, 2014 USD ($) BRL / $ | Dec. 31, 2013 USD ($) | Feb. 10, 2015 VEF / $
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of revenues and operating costs generated in foreign operations |  |  | 99.80% |  | 99.70% |  |  |  |
Long-lived assets and goodwill located in the foreign operations |  | $ 184,178 | $ 198,302 | $ 184,178 |  | $ 184,178 |  |  |
Foreign currency gains (losses) |  |  | $ 5,147 |  | $ (8,570) |  |  |  |
Exchange rate used to re-measure transactions | VEF / $ |  |  | 273.00 |  |  |  |  |  | 12
Foreign exchange gain (loss) |  |  |  |  | 20,400 |  |  |  |
Impairment of Long lived assets |  |  |  |  | 16,226 |  |  |  |
Long-Lived Assets |  | 81,633 | $ 89,932 | 81,633 |  | 81,633 |  |  |
Liabilities |  | 664,148 | $ 730,403 | 664,148 |  | 664,148 |  |  |
Percentage on relief of total income tax |  |  | 60.00% |  |  |  |  |  |
Percentage on relief of payroll tax |  |  | 70.00% |  |  |  |  |  |
Income tax expense (benefit) |  |  | $ 6,956 |  | 14,655 |  |  |  |
Decrease current deferred tax assets |  |  | 12,290 |  |  |  |  |  |
Decrease current deferred tax liabilities |  |  |  |  | 2,551 |  |  |  |
Foreign tax credit |  | 10,102 | 11,030 | 10,102 |  | 10,102 |  |  |
New Software Development Law [Member] |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Income tax gain |  |  | 372,000 |  |  |  |  |  |
Income tax expense (benefit) |  |  | (4,342) |  |  |  |  |  |
Labor cost gain |  |  | $ 957,000 |  |  |  |  |  |
Aggregate per share effect of the Argentine tax holiday | $ / shares |  |  | $ 0.12 |  |  |  |  |  |
Venezuelan Operations [Member] |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency gains (losses) |  |  |  |  |  | 0 | $ 0 | $ 0 |
Cumulative Inflation Rate Period |  |  | 3 years |  |  |  |  |  |
Foreign currency inflation rate |  |  | 100.00% |  |  |  |  |  |
Impairment of Long lived assets |  |  |  |  | 16,200 |  |  |  |
Liabilities |  | 36,266 | $ 39,781 | 36,266 |  | 36,266 |  |  |
Fair value of real estate properties |  |  |  |  | $ 9,200 |  |  |  |
Percentage of consolidated net assets |  |  | 9.10% |  |  |  |  |  |
Percentage of consolidated cash and investments |  |  | 2.00% |  |  |  |  |  |
Venezuelan Operations [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Liabilities |  | $ 24,634 | $ 29,248 | 24,634 |  | $ 24,634 |  |  |
Argentinean Subsidiaries [Member] |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency gains (losses) |  |  |  | $ 18,200 |  |  |  |  |
Exchange rate used to re-measure transactions | ARS / $ |  | 13.30 | 14.80 | 13.30 |  | 13.30 |  |  |
Percentage of increase in exchange ratio |  | 37.00% |  |  |  |  |  |  |
Other comprehensive income |  |  |  | $ 22,800 |  |  |  |  |
Foreign currency monthly purchases monetary cap |  |  | $ 2,000 |  |  |  |  |  |
Brazilian Subsidiaries [Member] |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency gains (losses) |  |  |  |  |  | $ 14,600 |  |  |
Exchange rate used to re-measure transactions | BRL / $ |  | 3.90 | 3.56 | 3.90 |  | 3.90 | 2.66 |  |
Percentage of increase in exchange ratio |  |  |  |  |  | 47.00% |  |  |
Other comprehensive income |  |  |  |  |  | $ 9,000 |  |  |
2.25% Convertible Senior Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 330,000 | $ 330,000 | $ 330,000 | $ 330,000 |  | $ 330,000 |  |  |
Debt instrument, interest rate | 2.25% |  | 2.25% |  |  |  |  |  |
Fair value, discount rate | 5.55% |  |  |  |  |  |  |  |
Payment for capped call transactions | $ 19,668 |  |  |  |  |  |  |  |
Carrying value of the permanent equity component reported in additional paid-in-capital | 46,985 |  |  |  |  |  |  |  |
Net carrying amount | $ 283,015 |  |  |  |  |  |  |  |
Effective interest rate | 6.10% |  |  |  |  |  |  |  |
Deferred tax liability, additional paid in capital component of convertible debt | $ 16,445 |  |  |  |  |  |  |  |
Net of deferred income tax effect amounts | $ 12,784 |  |  |  |  |  |  |  |

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