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Debt (Details Textual) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Nov. 02, 2007
Sep. 30, 2012
Pst Eletronica Ltda [Member]
Sep. 30, 2012
Bolton Conductive Systems L L C [Member]
Sep. 30, 2012
Term Loan [Member]
Pst Eletronica Ltda [Member]
Sep. 30, 2012
Term Loan One [Member]
Sep. 30, 2012
Term Loan Two [Member]
Sep. 30, 2012
Revolving Credit Facility [Member]
Pst Eletronica Ltda [Member]
Sep. 30, 2012
Revolving Credit Facility [Member]
Bolton Conductive Systems L L C [Member]
Oct. 13, 2009
Revolving Credit Facility [Member]
Bolton Conductive Systems L L C [Member]
Oct. 31, 2010
Senior Notes [Member]
Sep. 30, 2012
Senior Notes [Member]
Dec. 31, 2011
Senior Notes [Member]
Oct. 04, 2010
Senior Notes [Member]
Sep. 30, 2012
Line Of Credit [Member]
Dec. 31, 2011
Line Of Credit [Member]
Sep. 30, 2012
Line Of Credit [Member]
Federal Funds Rate [Member]
Sep. 30, 2012
Line Of Credit [Member]
Margin Rate [Member]
Sep. 30, 2012
Line Of Credit [Member]
L I B O R Rate [Member]
Debt Instrument, Annual Principal Payment           $ 1,223                            
Debt Instrument, Covenant Compliance As of September 30, 2012 and December 31, 2011, PST was in compliance with all loan covenants. As of September 30, 2012 and December 31, 2011, PST was in compliance with all loan covenants.                                    
Debt Instrument, Description of Variable Rate Basis                   prime referenced rate plus a 2.5% margin           Interest is payable quarterly at either (i) the higher of the prime rate or the Federal Funds rate plus 0.50%, plus a margin of 0.00% to 0.25% or (ii) LIBOR plus a margin of 1.00% to 1.75%, depending upon the Company''''s undrawn availability, as defined.   0.50    
Debt Instrument, Frequency of Periodic Payment           monthly or annually       monthly                    
Debt Instrument, Interest Rate, Stated Percentage               125.00%         9.50%   9.50%          
Debt Instrument, Maturity Date             Aug. 29, 2012         Oct. 15, 2017       Dec. 01, 2016        
Debt Instrument, Payment Terms                       Interest payments are payable on April 15 and October 15 of each year.                
Debt Instrument, Unamortized Discount, Percentage                             2.50%          
Line of Credit Facility, Commitment Fee Percentage 0.375%                                      
Line of Credit Facility, Maximum Borrowing Capacity     100,000   3,000       0   3,000         71,051 29,540      
Line of Credit, Current                   0                    
Secured Long-term Debt, Noncurrent                             175,000          
Debt Instrument Basis Spread On Variable Maximum Rate                                     0.25% 1.75%
Debt Instrument Basis Spread On Variable Minimum Rate                                     0.00% 1.00%
Debt Instrument Redeemable Percentage                             104.75%          
Line Of Credit Facility Covenant Limits 15,000                                      
Amortization of Debt Discount (Premium)                         3,429 3,807            
Maturity Period Of Long Term Debt       2013                                
Debt Instrument, Issuer             Company's wholly-owned subsidiary located in Suzhou, China Company's wholly-owned subsidiary located in Suzhou, China                        
Debt Instrument, Issuance Date             Sep. 02, 2011 Aug. 29, 2012                        
Debt Instrument, Face Amount             9,000 9,000                        
Long-term Debt, Gross               1,432                        
Line of Credit Facility, Initiation Date         Oct. 13, 2009                              
Line of Credit Facility, Expiration Date         Sep. 30, 2013                              
Line of Credit Facility, Interest Rate Description         Interest is payable monthly at the prime referenced rate plus a 2.5% margin.                              
Long-Term Debt, Excluding Current Maturities 181,914 183,711       7,654                            
Long-Term Debt, Current Maturities $ 28,214 $ 44,246       $ 313