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Acquisitions (Tables)
 3 Months Ended
Mar. 31, 2019
Business Combinations [Abstract]  
Schedule of Consideration Transferred Fair Value of Consideration Transferred:
(in thousands)
Granta Design
 
Helic
 
Total
Cash
$
198,723

 
$
62,086

 
$
260,809
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed Recognized Amounts of Identifiable Assets Acquired and Liabilities Assumed:
(in thousands)
 
 
 
 
 
Cash
$
13,644

 
$
2,842

 
$
16,486

Accounts receivable and other tangible assets
6,926

 
6,008

 
12,934

Developed software and core technologies (12 year weighted-average life)
32,445

 
8,600

 
41,045

Customer lists (13 year weighted-average life)
20,016

 
11,500

 
31,516

Trade names (10 year weighted-average life)
4,579

 
890

 
5,469

Accounts payable and other liabilities
(6,176
)
 
(3,477
)
 
(9,653
)
Deferred revenue
(1,426
)
 
(923
)
 
(2,349
)
Net deferred tax liabilities
(9,822
)
 
(5,049
)
 
(14,871
)
Total identifiable net assets
$
60,186

 
$
20,391

 
$
80,577

Goodwill
$
138,537

 
$
41,695

 
$
180,232