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Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Intangible asset activity        
Net balance     $ 27,196  
Additions     16  
Disposals-Other     (21)  
Net foreign currency translation     143  
Amortization expense $ (1,534) $ (2,335) (3,107) $ (4,689)
Net balance 24,227   24,227  
Intangible assets, net        
Balance at cost 97,116   97,116  
Accumulated amortization (72,889)   (72,889)  
Total intangible assets 24,227   24,227  
Impairment charges     0 $ 0
Acquired Technology        
Intangible asset activity        
Net balance     2,277  
Additions     2  
Net foreign currency translation     31  
Amortization expense     (778)  
Net balance 1,532   1,532  
Intangible assets, net        
Balance at cost 43,436   43,436  
Accumulated amortization (41,904)   (41,904)  
Total intangible assets 1,532   1,532  
Customer relationships        
Intangible asset activity        
Net balance     23,200  
Net foreign currency translation     106  
Amortization expense     (2,004)  
Net balance 21,302   21,302  
Intangible assets, net        
Balance at cost 40,121   40,121  
Accumulated amortization (18,819)   (18,819)  
Total intangible assets 21,302   21,302  
Other        
Intangible asset activity        
Net balance     1,719  
Additions     14  
Disposals-Other     (21)  
Net foreign currency translation     6  
Amortization expense     (325)  
Net balance 1,393   1,393  
Intangible assets, net        
Balance at cost 13,559   13,559  
Accumulated amortization (12,166)   (12,166)  
Total intangible assets $ 1,393   $ 1,393