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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