Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Intangible Assets (Details)

v3.19.1
Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Amortizing Intangibles:    
Finite-Lived Trademarks, Gross $ 15,151 $ 15,474
Goodwill 40,294 40,294
Trademarks 15,151 15,474
Carrying Amount 64,726 67,031
Accumulated Amortization (26,128) (22,598)
Total amortization 38,598 44,433
Intangible Assets, Net (Including Goodwill) 53,749 59,907
Intangible assets 79,877 82,505
Patents [Member]    
Amortizing Intangibles:    
Finite-Lived Patents, Gross 26,662 26,662
Accumulated Amortization (12,046) (10,625)
Total amortization $ 14,616 $ 16,037
Patents [Member] | Minimum    
Amortizing Intangibles:    
Useful life 10 years 10 years
Patents [Member] | Maximum    
Amortizing Intangibles:    
Useful life 18 years 18 years
Customer Relationships    
Amortizing Intangibles:    
Useful life 12 years 3 months 12 days 12 years 3 months 12 days
Accumulated Amortization $ (13,868) $ (11,735)
Total amortization 23,982 28,396
Finite-Lived Customer Relationships, Gross $ 37,850 $ 40,131
Customer Relationships | Minimum    
Amortizing Intangibles:    
Useful life 10 years 10 years
Customer Relationships | Maximum    
Amortizing Intangibles:    
Useful life 21 years 21 years
Other Intangible Assets [Member]    
Amortizing Intangibles:    
Accumulated Amortization $ (214) $ (238)
Total amortization 0 0
Other Finite-Lived Intangible Assets, Gross $ 214 $ 238
Purchased technology, customer relationships and patents | Weighted Average [Member]    
Amortizing Intangibles:    
Useful life 15 years 9 months 12 days 15 years 9 months 6 days