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INTANGIBLE ASSETS AND GOODWILL (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Intangible Assets And Goodwill          
Weighted average amortization period (years)   7 years 9 months 25 days 7 years 10 months 17 days    
Cost $ 349,350,000       $ 338,150,000
Accumulated amortization 135,984,000       86,759,000
Net carrying value 213,366,000       251,391,000
Amortization and impairment   $ 49,225,000 $ 49,723,000 $ 22,583,000  
Estimated future amortization expense for intangible assets          
2020 48,952,000        
2021 43,495,000        
2022 35,092,000        
2023 27,271,000        
2024 20,201,000        
Thereafter 38,355,000        
Total 213,366,000        
Goodwill [Roll Forward]          
Goodwill 392,302,000     338,822,000 386,761,000
Accumulated impairment losses (167,406,000)     (3,106,000) (3,106,000)
Goodwill at the beginning of the period   383,655,000 335,716,000    
Impairment of goodwill (164,300,000.0) (164,300,000) 0 0  
Goodwill at the end of the period 224,896,000 $ 383,655,000 $ 335,716,000 335,716,000 383,655,000
In-process research and development          
Intangible Assets And Goodwill          
Cost 5,600,000       5,600,000
Accumulated amortization 0       0
Net carrying value 5,600,000       5,600,000
Developed technology          
Intangible Assets And Goodwill          
Weighted average amortization period (years)   6 years 9 months 15 days 6 years 10 months 28 days    
Cost 188,880,000       182,880,000
Accumulated amortization 100,760,000       63,187,000
Net carrying value 88,120,000       119,693,000
Amortization and impairment   $ 37,573,000 $ 38,976,000 18,358,000  
Estimated future amortization expense for intangible assets          
Impairment of intangible assets and goodwill       5,500,000  
Customer relationships          
Intangible Assets And Goodwill          
Weighted average amortization period (years)   9 years 5 months 14 days 9 years 5 months 10 days    
Cost 152,140,000       146,940,000
Accumulated amortization 33,350,000       22,218,000
Net carrying value 118,790,000       124,722,000
Amortization and impairment   $ 11,132,000 $ 10,203,000 4,145,000  
Trade names          
Intangible Assets And Goodwill          
Weighted average amortization period (years)   5 years 2 months 12 days 5 years 2 months 12 days    
Cost 2,000,000       2,000,000
Accumulated amortization 1,144,000       624,000
Net carrying value 856,000       1,376,000
Amortization and impairment   $ 520,000 $ 544,000 $ 80,000  
Internal use software          
Intangible Assets And Goodwill          
Weighted average amortization period (years)   3 years 3 years    
Cost 730,000       730,000
Accumulated amortization 730,000       730,000
Net carrying value 0       $ 0
Anova Data, Inc.          
Goodwill [Roll Forward]          
Acquisition   $ 5,541,000 $ 0    
Goodwill at the end of the period 5,500,000        
Edgewater          
Goodwill [Roll Forward]          
Acquisition   0 48,053,000    
Goodwill at the end of the period $ 48,053,000        
Taqua, LLC          
Goodwill [Roll Forward]          
Write-off of goodwill attributable to dissolved subsidiary   $ 0 $ (114,000)