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Debt (Details Textual)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
USD ($)
Dec. 31, 2011
USD ($)
Nov. 02, 2007
USD ($)
Jun. 30, 2012
Psteletronicaltda [Member]
USD ($)
Jun. 30, 2012
Subsidiaries [Member]
USD ($)
Jun. 30, 2012
Installment Note [Member]
Dec. 31, 2011
Installment Note [Member]
USD ($)
Jun. 30, 2012
Installment Note [Member]
Psteletronicaltda [Member]
Jun. 30, 2012
Installment Note [Member]
Margin Rate [Member]
Jun. 30, 2012
Term Loan [Member]
Psteletronicaltda [Member]
USD ($)
Jun. 30, 2012
Term Loan [Member]
Subsidiaries [Member]
Sep. 02, 2011
Term Loan [Member]
Subsidiaries [Member]
CNY
Jun. 30, 2012
Revolving Credit Facility [Member]
Psteletronicaltda [Member]
USD ($)
Jun. 30, 2012
Revolving Credit Facility [Member]
Bolton Conductive Systems L L C [Member]
USD ($)
Dec. 31, 2011
Revolving Credit Facility [Member]
Bolton Conductive Systems L L C [Member]
USD ($)
Oct. 13, 2009
Revolving Credit Facility [Member]
Bolton Conductive Systems L L C [Member]
USD ($)
Oct. 31, 2010
Senior Notes [Member]
Jun. 30, 2012
Senior Notes [Member]
USD ($)
Dec. 31, 2011
Senior Notes [Member]
USD ($)
Oct. 04, 2010
Senior Notes [Member]
USD ($)
Jun. 30, 2012
Line Of Credit [Member]
USD ($)
Dec. 31, 2011
Line Of Credit [Member]
USD ($)
Jun. 30, 2012
Line Of Credit [Member]
Federal Funds Rate [Member]
Jun. 30, 2012
Line Of Credit [Member]
Margin Rate [Member]
Jun. 30, 2012
Line Of Credit [Member]
L I B O R Rate [Member]
Debt Instrument, Annual Principal Payment                   $ 1,225                              
Debt Instrument, Basis Spread on Variable Rate                 2.25%         2.00%                      
Debt Instrument, Covenant Compliance As of June 30, 2012 and December 31, 2011, PST was in compliance with all loan covenants. As of June 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 2.0% 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       monthly or annually quarterly     monthly                      
Debt Instrument, Interest Rate, Stated Percentage             5.50%         127.00%           9.50%   9.50%          
Debt Instrument, Maturity Date               Sep. 30, 2012     Sep. 01, 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                   0     3,000         63,297 29,540      
Line of Credit, Current                           0 1,181                    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months                   956                              
Long-Term Debt Maturities Repayments Of Principal Remainder Of Fiscal Year         0                                        
Long-term Debt, Weighted Average Interest Rate                                   9.50% [1]              
Loans Payable, Noncurrent                       9,000                          
Notes Payable, Current             188                                    
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)                                   3,558 3,807            
Long-term debt $ 218,883 $ 227,957   $ 8,319                           $ 173,274 [1] $ 172,271 [1]            
Maturity Period Of Long Term Debt       2013                                          
[1] Weighted average interest rate excludes the impact of the Company's interest rate swap and the accretion of debt discount.