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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Tax Credit Carryforward [Line Items]                        
Income tax expense (benefit)   $ 6,414 $ (1,954) $ (8,110) $ (61,856) $ 2,370 $ 4,450 $ 5,404 $ 3,410 $ (65,506) $ 15,634 $ 529
Proceeds from Income Tax Refunds                   51,400    
Income taxes receivable   57,503       37,888       57,503 37,888  
Deferred tax assets (liabilities), gross   187,192       202,610       187,192 202,610  
Valuation allowance   183,649       200,441       183,649 200,441  
Net operating loss carryforwards and credits - state and local   67,293       70,254       67,293 70,254  
Total interest and penalties                   (1,600) (2,700) $ (2,900)
Accruals for interest and penalties   3,400       6,600       3,400 6,600  
Liability for selected tax items   20,600       10,600       $ 20,600 10,600  
Range of period where there is possible change in unrecognized tax benefits                   12 months    
Reasonably possible decrease of unrecognized tax benefits   11,600               $ 11,600    
U.S.                        
Tax Credit Carryforward [Line Items]                        
Income tax expense (benefit)                   62,600    
Deferred tax assets (liabilities), gross   182,700               182,700    
Valuation allowance   182,700       199,500       182,700 199,500  
U.S. NOL carryforwards   190,500               190,500    
Net operating loss carryforwards and credits - state and local   67,300               67,300    
USVI                        
Tax Credit Carryforward [Line Items]                        
Income tax expense (benefit)                   1,400    
Income taxes receivable   12,900               12,900    
Valuation allowance   400       $ 400       400 400  
Expected carry back of net operating loss   334,500               334,500    
US and USVI                        
Tax Credit Carryforward [Line Items]                        
Income tax expense (benefit)                   64,000    
India and Philippines Subsidiary                        
Tax Credit Carryforward [Line Items]                        
Deferred tax liability   300               300    
Annual Limitations on Utilization of Tax Attributes                        
Tax Credit Carryforward [Line Items]                        
Decrease in deferred tax asset                     160,900  
Foreign Tax Credit                        
Tax Credit Carryforward [Line Items]                        
Decrease in deferred tax asset                     29,500  
SEC Schedule, 12-09, Valuation Allowance, Tax Credit Carryforward                        
Tax Credit Carryforward [Line Items]                        
Income taxes receivable   24,000               24,000    
Decrease in deferred tax asset                     $ 55,700  
SEC Schedule, 12-09, Valuation Allowance, Operating Loss Carryforward | Subsequent Event                        
Tax Credit Carryforward [Line Items]                        
Proceeds from Income Tax Refunds $ 24,000                      
SEC Schedule, 12-09, Valuation Allowance, Operating Loss Carryforward | U.S.                        
Tax Credit Carryforward [Line Items]                        
Valuation allowance on deferred tax assets   40,000               40,000    
Capital Loss Carryforward | U.S.                        
Tax Credit Carryforward [Line Items]                        
Capital loss carryforwards   $ 7,900               $ 7,900