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Business Combinations - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
12 Months Ended 13 Months Ended
Dec. 01, 2016
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Goodwill   $ 385,574 $ 385,574 $ 382,963 $ 10,136
Minimum          
Measurement Period Adjustments          
Estimated Useful Life (years)   1 year      
Maximum          
Measurement Period Adjustments          
Estimated Useful Life (years)   15 years      
DTS Merger          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Cash and cash equivalents $ 53,377 $ 53,377 53,377    
Accounts receivable 27,114 27,114 27,114    
Unbilled contracts receivable, short-term 52,845 48,881 48,881    
Other current assets 5,269 5,269 5,269    
Prepaid income taxes 3,278 3,278 3,278    
Property and equipment 33,573 33,573 33,573    
Goodwill 372,827 375,438 375,438    
Total identifiable intangible assets 469,078 469,078 469,078    
Long-term deferred tax assets 637 637 637    
Unbilled contracts receivable, long-term 12,464 12,464 12,464    
Other assets 4,423 4,423 4,423    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Accounts payable (4,006) (4,006) (4,006)    
Accrued liabilities (19,727) (19,906) (19,906)    
Deferred revenue (561) (561) (561)    
Income taxes payable (727) (727) (727)    
Long-term deferred tax liabilities (39,822) (38,290) (38,290)    
Other long-term liabilities (15,337) (15,337) (15,337)    
Aggregate purchase price 954,705 $ 954,705 954,705    
Measurement Period Adjustments          
Unbilled contracts receivable, short-term     (3,964)    
Goodwill     2,611    
Accrued liabilities     (179)    
Long-term deferred tax liabilities     $ 1,532    
DTS Merger | Customer contracts and related relationships          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Identifiable intangible assets $ 281,569        
DTS Merger | Customer contracts and related relationships | Minimum          
Measurement Period Adjustments          
Estimated Useful Life (years) 3 years        
DTS Merger | Customer contracts and related relationships | Maximum          
Measurement Period Adjustments          
Estimated Useful Life (years) 7 years        
DTS Merger | Developed technology          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Identifiable intangible assets $ 143,639        
DTS Merger | Developed technology | Minimum          
Measurement Period Adjustments          
Estimated Useful Life (years) 5 years        
DTS Merger | Developed technology | Maximum          
Measurement Period Adjustments          
Estimated Useful Life (years) 6 years        
DTS Merger | Trademarks and tradenames          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Identifiable intangible assets $ 38,483        
Measurement Period Adjustments          
Estimated Useful Life (years) 8 years        
DTS Merger | Noncompete agreements          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Identifiable intangible assets $ 2,231        
Measurement Period Adjustments          
Estimated Useful Life (years) 1 year        
DTS Merger | In-process research and development (IPR&D)          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
In-process research and development (IPR&D) $ 3,156