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Debt (Details)
€ in Thousands, $ in Thousands, ¥ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 96 Months Ended
Sep. 07, 2018
USD ($)
Sep. 01, 2017
USD ($)
Sep. 01, 2017
JPY (¥)
Jul. 31, 2017
EUR (€)
Jul. 31, 2017
USD ($)
Jan. 31, 2017
EUR (€)
Jan. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Rate
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Rate
Feb. 01, 2025
EUR (€)
Feb. 01, 2025
USD ($)
Nov. 07, 2018
USD ($)
Mar. 31, 2018
USD ($)
Jul. 01, 2017
EUR (€)
Jul. 01, 2017
USD ($)
May 02, 2016
USD ($)
Debt                                    
Gain (Loss) on Extinguishment of Debt                   $ (15,988) $ (486)              
Long-term Debt               $ 305,676   305,676         $ 324,623      
Debt, Long-term and Short-term, Combined Amount [Abstract]                                    
Revolving line of credit               0   0                
Current maturities               (28,416)   (28,416)         (20,540)      
Total long-term debt               277,260   277,260         304,083      
Interest expense                                    
Contractual interest expense               4,034 $ 6,680 17,775 23,762              
Capitalized interest               (41) (41) (161) (80)              
Amortization of debt issuance costs               53 98 262 410              
Amortization of debt (premium) discount               383 570 780 1,326              
Imputed interest on acquisition-related obligations               14 28 43 84              
Interest expense on capital lease               37 72 104 230              
Total interest expense               4,480 7,407 18,803 25,732              
Long-term Debt, Unclassified [Abstract]                                    
Restricted Cash               3,134 $ 0 3,134 $ 0              
Second part of loan       € 300 $ 300                          
Term Loan Facility                                    
Debt                                    
Long-term Debt               291,152   291,152         0      
Debt Issuance Costs, Net               (9,100)   (9,100)                
Long-term Debt, Unclassified [Abstract]                                    
Interest payable               1,000   1,000                
Advanced Payment from Original Equipment Manufacturer [Member]                                    
Debt                                    
Long-term Debt               8,870   8,870         0      
Debt Issuance Costs, Net               (600)   (600)                
Long-term Debt, Unclassified [Abstract]                                    
Proceeds from Issuance of Debt $ 9,500                                  
Advanced Payment from Original Equipment Manufacturer [Member] | Line of Credit [Member]                                    
Debt                                    
Line of Credit Facility, Maximum Borrowing Capacity               66,000   66,000                
Term Loan Credit Agreement                                    
Debt                                    
Gain (Loss) on Extinguishment of Debt                   16,000                
Long-term Debt               0   0       $ 323,400 318,782      
Debt Issuance Costs, Net                             (13,300)      
Long-term Debt, Unclassified [Abstract]                                    
Interest payable                             200      
Revolving Credit Facility [Member]                                    
Line of Credit Facility [Abstract]                                    
Current borrowing capacity                                   $ 75,000
Remaining borrowing capacity               62,400   62,400                
Other Debt Obligations [Member]                                    
Debt                                    
Long-term Debt               5,654   5,654         5,841      
Long-term Debt, Unclassified [Abstract]                                    
Proceeds from Issuance of Debt           € 2,200 $ 2,500                      
Debt Instrument, Unamortized Discount               (400)   (400)         $ (500) € (600) $ (700)  
Scenario, Forecast [Member] | Other Debt Obligations [Member]                                    
Long-term Debt, Unclassified [Abstract]                                    
Long-term Debt, Maturities, Repayment Terms                       P8Y P8Y          
TOKIN [Member] | Other Debt Obligations [Member]                                    
Debt                                    
Line of Credit, Debt Issue Discount Percent | Rate                 0.04%   0.04%              
Long-term Debt, Unclassified [Abstract]                                    
Proceeds from Issuance of Debt   $ 3,200 ¥ 350.0                              
Initial Repayment [Member] [Member] | Scenario, Forecast [Member] | Other Debt Obligations [Member]                                    
Long-term Debt, Unclassified [Abstract]                                    
Repayments of Other Debt                       € 200 $ 200          
Remaining Repayment [Member] | Scenario, Forecast [Member] | Other Debt Obligations [Member]                                    
Long-term Debt, Unclassified [Abstract]                                    
Repayments of Other Debt                       € 210 $ 248          
Prepaid Expenses and Other Current Assets                                    
Long-term Debt, Unclassified [Abstract]                                    
Restricted Cash               $ 3,100   $ 3,100