XML 78 R60.htm IDEA: XBRL DOCUMENT v3.20.4
Restructuring charges - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 14, 2020
Mar. 15, 2017
Mar. 31, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]            
Restructuring charges       $ 25,396 $ 1,454 $ 22,743
Operating Lease, Impairment Loss       12,460 0 0
First quarter 2017 restructuring [Member]            
Restructuring Cost and Reserve [Line Items]            
Expected percent of positions eliminated   17.00%        
Restructuring charges     $ 23,100      
Other Restructuring Costs       (57) 1,395 4,783
First quarter 2017 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges     12,800      
First quarter 2017 restructuring [Member] | Employee Severance and Pay Related Costs [Member]            
Restructuring Cost and Reserve [Line Items]            
Severance Costs     $ 10,300 0 $ 0 $ 0
Second quarter 2020 restructuring [Member]            
Restructuring Cost and Reserve [Line Items]            
Expected percent of positions eliminated 20.00%          
Restructuring charges       25,500    
Other Restructuring Costs       5,800    
Second quarter 2020 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges       5,800    
Second quarter 2020 restructuring [Member] | Employee Severance and Pay Related Costs [Member]            
Restructuring Cost and Reserve [Line Items]            
Severance Costs       $ 7,287