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Debt (Narrative) (Details)
¥ in Thousands, kr in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
SEK (kr)
Jun. 30, 2019
CNY (¥)
Jun. 30, 2019
USD ($)
Jun. 05, 2019
USD ($)
Dec. 31, 2018
SEK (kr)
Dec. 31, 2018
USD ($)
Sep. 12, 2014
USD ($)
Nov. 02, 2007
USD ($)
Debt Instrument [Line Items]                    
Borrowings outstanding         $ 103,500     $ 96,000    
Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Capitalized deferred financing costs         1,183          
Line of credit facility, maximum borrowing capacity           $ 400,000     $ 300,000  
Increase in maximum borrowing capacity of credit facility           $ 150        
Borrowings outstanding         103,500     96,000    
Write off of deferred debt issuance cost $ 275                  
Debt instrument covenant default of other debt maximum amount         $ 30,000          
Debt instrument covenant uninsured asset losses maximum amount   $ 30,000                
Revolving Credit Facility [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Long-term debt, weighted average interest rate     3.45% 3.45% 3.45%          
Revolving Credit Facility [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Long-term debt, weighted average interest rate     3.28% 3.28% 3.28%          
Asset-Based Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity                   $ 100,000
Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity       ¥ 60,000 $ 8,740          
Borrowings outstanding         0     0    
Letter of Credit [Member]                    
Debt Instrument [Line Items]                    
Outstanding letters of credit         1,815     1,815    
Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Credit Facility covenant compliance   The Company was in compliance with all credit facility covenants at June 30, 2019 and December 31, 2018                
PST Debt [Member]                    
Debt Instrument [Line Items]                    
Notes covenant compliance   The Company was in compliance with all debt covenants at June 30, 2019 and December 31, 2018                
PST Eletronica Ltda [Member] | Term Loan [Member]                    
Debt Instrument [Line Items]                    
2019         869          
2020         258          
2021         $ 474          
PST Eletronica Ltda [Member] | PST Long-Term Notes [Member]                    
Debt Instrument [Line Items]                    
Long-term debt, weighted average interest rate     7.00% 7.00% 7.00%          
PST Eletronica Ltda [Member] | PST Short-Term Notes [Member]                    
Debt Instrument [Line Items]                    
Short-term debt, weighted average interest rate     6.00% 6.00% 6.00%          
Electronics [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity     kr 20,000   $ 2,155   kr 20,000 2,259    
Borrowings outstanding         $ 0     $ 0