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Debt (Details)
$ in Thousands, € in Millions, ¥ in Millions
1 Months Ended 3 Months Ended 66 Months Ended 96 Months Ended
Sep. 07, 2018
USD ($)
Sep. 01, 2017
USD ($)
Sep. 01, 2017
JPY (¥)
Feb. 28, 2019
EUR (€)
Feb. 28, 2019
USD ($)
Jul. 31, 2017
EUR (€)
Jul. 31, 2017
USD ($)
Jan. 31, 2017
EUR (€)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Sep. 01, 2026
EUR (€)
Feb. 01, 2025
EUR (€)
Feb. 01, 2025
USD ($)
Mar. 31, 2019
USD ($)
Nov. 07, 2018
USD ($)
Nov. 07, 2018
JPY (¥)
Dec. 31, 2017
Rate
May 02, 2016
USD ($)
Debt                                    
Long-term Debt                 $ 312,096         $ 294,471        
Debt, Long-term and Short-term, Combined Amount [Abstract]                                    
Revolving line of credit                 0                  
Current maturities                 (29,225)         (28,430)        
Total long-term debt                 282,871         266,041        
Interest expense                                    
Contractual interest expense                 1,740 $ 6,845                
Capitalized interest                 (105) (64)                
Amortization of debt issuance costs                 127 116                
Amortization of debt (premium) discount                 767 98                
Imputed interest on acquisition-related obligations                 0 15                
Interest expense on finance leases                 16 26                
Total interest expense                 2,545 7,036                
Long-term Debt, Unclassified [Abstract]                                    
Payments to Acquire Property, Plant, and Equipment                 37,112 16,021                
Restricted Cash                 2,575 $ 0                
Second part of loan           € 0.3 $ 300                      
Term Loan Facility                                    
Debt                                    
Long-term Debt                 284,623         276,808   ¥ 33,000.0    
Debt Issuance Costs, Net                 (8,900)         (8,700)        
Long-term Debt, Unclassified [Abstract]                                    
Interest payable                 1,700                  
Advanced Payment from Original Equipment Manufacturer [Member]                                    
Debt                                    
Long-term Debt                 20,906         11,270        
Debt Issuance Costs, Net                 (5,000)         (2,100)        
Long-term Debt, Unclassified [Abstract]                                    
Proceeds from Issuance of Debt $ 26,000                                  
Payments to Acquire Property, Plant, and Equipment                 7,700                  
Advanced Payment from Original Equipment Manufacturer [Member] | Line of Credit [Member]                                    
Debt                                    
Line of Credit Facility, Maximum Borrowing Capacity                 72,000                  
Term Loan Credit Agreement                                    
Debt                                    
Long-term Debt                             $ 323,400      
Revolving Credit Facility [Member]                                    
Line of Credit Facility [Abstract]                                    
Current borrowing capacity                                   $ 75,000
Remaining borrowing capacity                 62,500                  
Other Debt Obligations [Member]                                    
Debt                                    
Long-term Debt                 6,567         6,393        
Long-term Debt, Unclassified [Abstract]                                    
Debt Instrument, Unamortized Discount                 $ (600)         $ (600)        
Portuguese Government Loan 2 [Member] | Other Debt Obligations [Member]                                    
Long-term Debt, Unclassified [Abstract]                                    
Proceeds from Issuance of Debt       € 0.9 $ 1,100                          
Forecast [Member] | Portuguese Government Loan 2 [Member] | Other Debt Obligations [Member]                                    
Long-term Debt, Unclassified [Abstract]                                    
Repayments of Other Debt | €                     € 0.1              
TOKIN [Member] | Other Debt Obligations [Member]                                    
Debt                                    
Line of Credit, Debt Issue Discount Percent | Rate                                 0.04%  
Line of Credit Facility [Abstract]                                    
Rate                 0.53%                  
Long-term Debt, Unclassified [Abstract]                                    
Proceeds from Issuance of Debt   $ 3,200 ¥ 350.0                              
Initial Repayment [Member] [Member] | Forecast [Member] | Portuguese Government Loan 1 [Member] | Other Debt Obligations [Member]                                    
Long-term Debt, Unclassified [Abstract]                                    
Repayments of Other Debt                       € 0.2 $ 200          
Prepaid Expenses and Other Current Assets                                    
Long-term Debt, Unclassified [Abstract]                                    
Restricted Cash                 $ 2,600                  
Euro Member Countries, Euro | Portuguese Government Loan 1 [Member] | Other Debt Obligations [Member]                                    
Long-term Debt, Unclassified [Abstract]                                    
Proceeds from Issuance of Debt | €               € 2.2                    
United States of America, Dollars | Portuguese Government Loan 1 [Member] | Other Debt Obligations [Member]                                    
Long-term Debt, Unclassified [Abstract]                                    
Proceeds from Issuance of Debt | €               € 2.5