Annual report pursuant to Section 13 and 15(d)

Segment and Geographic Information - Narrative (Details)

v3.19.1
Segment and Geographic Information - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
manufacturing_site
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2019
USD ($)
business_group
manufacturing_site
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Segment Reporting [Abstract]                      
Number of business groups | business_group                 3    
Segment and geographic information                      
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down                 $ 1,660 $ (992) $ 10,671
Net sales (1) $ 355,794 $ 350,175 $ 349,233 $ 327,616 $ 318,091 $ 306,576 $ 301,568 $ 273,946 1,382,818 1,200,181 757,338
Write down of long-lived assets                    
Assets 1,318,095       1,222,923       1,318,095 1,222,923  
Operating income (loss) 54,057 $ 61,616 $ 50,000 $ 35,176 21,646 $ 32,002 $ 31,597 $ 27,607 200,849 112,852 34,968
Depreciation and amortization (1)                 52,628 50,661 38,151
Solid Capacitors                      
Segment and geographic information                      
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down                 235 689 2,303
Assets $ 794,402       704,851       $ 794,402 704,851  
Number of manufacturing sites | manufacturing_site 10               10    
Operating income (loss)                 $ 348,150 234,473 147,662
Depreciation and amortization (1)                 28,795 27,329 20,824
Film and Electrolytic                      
Segment and geographic information                      
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down                 (93) (3,356) 8,339
Assets $ 219,711       240,968       $ 219,711 240,968  
Number of manufacturing sites | manufacturing_site 9               9    
Operating income (loss)                 $ 8,183 3,622 (9,028)
Depreciation and amortization (1)                 9,763 10,918 11,766
Electro-magnetic, Sensors & Actuators [Member]                      
Segment and geographic information                      
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down                 0 1,272 0
Assets $ 234,419       254,193       $ 234,419 254,193  
Number of manufacturing sites | manufacturing_site 4               4    
Operating income (loss)                 $ 22,546 15,694 0
Depreciation and amortization (1)                 5,226 4,407 0
Corporate                      
Segment and geographic information                      
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down                 1,518 403 29
Assets $ 69,563       $ 22,911       69,563 22,911  
Operating income (loss)                 (178,030) (140,937) (103,666)
Depreciation and amortization (1)                 8,844 8,007 5,561
Sales Revenue, Goods, Net [Member] | Sales risk                      
Segment and geographic information                      
Net sales (1)                 $ 184,300 $ 133,500 $ 104,400