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Intangible Assets and Liabilities
 3 Months Ended
Mar. 31, 2020
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets and Liabilities Intangible Assets and Liabilities
The gross carrying amount and accumulated amortization (accretion) of our intangible assets and liabilities, other than goodwill, were as follows:
March 31, 2020December 31, 2019
In thousandsGrossAccumulated
(Amortization) Accretion		NetGrossAccumulated
(Amortization) Accretion		Net
Intangible Assets
Core-developed technology$501,124  $(457,310) $43,814  $507,669  $(458,109) $49,560  
Customer contracts and relationships372,983  (251,122) 121,861  381,288  (251,509) 129,779  
Trademarks and trade names77,613  (73,083) 4,530  78,837  (73,732) 5,105  
Other12,019  (11,414) 605  12,020  (11,367) 653  
Total intangible assets
$963,739  $(792,929) $170,810  $979,814  $(794,717) $185,097  
Intangible Liabilities
Customer contracts and relationships$(23,900) $15,458  $(8,442) $(23,900) $13,450  $(10,450) 

A summary of intangible assets and liabilities activity is as follows:
Three Months Ended March 31,
In thousands20202019
Beginning balance, intangible assets, gross$979,814  $981,160  
Effect of change in exchange rates(16,075) 2,359  
Ending balance, intangible assets, gross$963,739  $983,519  
Beginning balance, intangible liabilities, gross$(23,900) $(23,900) 
Effect of change in exchange rates—  —  
Ending balance, intangible liabilities, gross$(23,900) $(23,900) 

On January 5, 2018, we completed our acquisition of Silver Spring Networks, Inc. (SSNI) and acquired intangible assets including in-process research and development (IPR&D), which were completed during 2019 and are now included within core-developed technology. Assumed intangible liabilities reflect the present value of the projected cash outflows for an existing contract where remaining costs are expected to exceed projected revenues.

Estimated future annual amortization (accretion) is as follows:
Year Ending December 31,AmortizationAccretionEstimated Annual Amortization, net
In thousands
2020 (amount remaining at March 31, 2020)$39,618  $(6,020) $33,598  
202137,572  (1,963) 35,609  
202227,212  (459) 26,753  
202319,674  —  19,674  
202415,523  —  15,523  
Thereafter31,211  —  31,211  
Total intangible assets subject to amortization (accretion)$170,810  $(8,442) $162,368