Annual report pursuant to Section 13 and 15(d)

Intangible Assets (Details)

v3.8.0.1
Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 71,968 $ 73,989
Finite-Lived Intangible Assets, Accumulated Amortization (60,533) (58,365)
Finite-Lived Intangible Assets, Net 11,435 15,624
Backlog [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 1,530 1,530
Finite-Lived Intangible Assets, Accumulated Amortization (1,530) (1,530)
Finite-Lived Intangible Assets, Net 0 0
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 23,260 24,867
Finite-Lived Intangible Assets, Accumulated Amortization (14,320) (13,547)
Finite-Lived Intangible Assets, Net 8,940 11,320
Product Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 45,195 45,234
Finite-Lived Intangible Assets, Accumulated Amortization (43,034) (41,431)
Finite-Lived Intangible Assets, Net 2,161 3,803
Noncompete Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 510 510
Finite-Lived Intangible Assets, Accumulated Amortization (510) (510)
Finite-Lived Intangible Assets, Net 0 0
Trademarks and Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 1,473 1,848
Finite-Lived Intangible Assets, Accumulated Amortization (1,139) (1,347)
Finite-Lived Intangible Assets, Net $ 334 $ 501