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GOODWILL AND INTANGIBLE ASSETS: (Tables)
 12 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill by operating segment and activity and by component included in each segment
Goodwill for the years ended March 31, 2019 and 2018 was as follows (dollars in thousands): 
 Total
Balance at March 31, 2017$200,393 
Acquisition of PDP (see Note 4 - Acquisitions)3,260 
Arbor purchase accounting adjustments(21)
Change in foreign currency translation adjustment7 
Balance at March 31, 2018$203,639 
Reallocation from AMS1,377 
Change in foreign currency translation adjustment(360)
Balance at March 31, 2019$204,656 

Goodwill by geography as of March 31, 2019 was:
 Total
U.S.$201,449 
APAC3,207 
Balance at March 31, 2019$204,656 
Schedule of amortization activity of intangible assets The following table shows the amortization activity of intangible assets (dollars in thousands):
 20192018
Developed technology, gross (Software)$54,000 $54,000 
Accumulated amortization$(49,625)(43,383)
Net developed technology$4,375 $10,617 
Customer relationship/Trade name, gross (Other assets, net)$35,800 $35,800 
Accumulated amortization$(26,128)(20,400)
Net customer/trade name$9,672 $15,400 
Publisher relationship, gross (Other assets, net)$23,800 $23,800 
Accumulated amortization$(9,255)(5,289)
Net publisher relationship$14,545 $18,511 
Total intangible assets, gross$113,600 $113,600 
Total accumulated amortization$(85,008)(69,072)
Total intangible assets, net$28,592 $44,528 
Schedule of estimated future amortization expenses related to purchases and other intangible assets were as follows As of March 31, 2019, estimated future amortization expenses related to purchased and other intangible assets were as follows (dollars in thousands): 
Year ending March 31,     
2020 $11,925 
2021 $8,083 
2022 $5,150 
2023 $3,434 
 $28,592