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Commitments and Contingencies (Narrative) (Details)
In Thousands, unless otherwise specified
12 Months Ended 24 Months Ended 0 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2013
Accrued Expenses and Other Current Liabilities [Member]
USD ($)
Dec. 31, 2012
Accrued Expenses and Other Current Liabilities [Member]
USD ($)
Dec. 31, 2013
PST Eletronicaltda [Member]
USD ($)
Dec. 31, 2013
PST Eletronicaltda [Member]
USD ($)
Dec. 31, 2012
PST Eletronicaltda [Member]
USD ($)
Dec. 31, 2013
Letter of Credit [Member]
USD ($)
Dec. 31, 2011
PST Eletronicaltda [Member]
Dec. 31, 2013
PST Eletronicaltda [Member]
USD ($)
Dec. 31, 2013
PST Eletronicaltda [Member]
BRL
Dec. 31, 2012
PST Eletronicaltda [Member]
Dec. 31, 2010
PST Eletronicaltda [Member]
Dec. 30, 2011
PST Eletronicaltda [Member]
Dec. 31, 2013
PST Eletronicaltda [Member]
Value AddedTax [Member]
USD ($)
Dec. 31, 2013
PST Eletronicaltda [Member]
Value AddedTax [Member]
BRL
Dec. 31, 2013
PST Eletronicaltda [Member]
Interest On Tax [Member]
USD ($)
Dec. 31, 2013
PST Eletronicaltda [Member]
Interest On Tax [Member]
BRL
Dec. 31, 2013
PST Eletronicaltda [Member]
Penalties On Tax [Member]
USD ($)
Dec. 31, 2013
PST Eletronicaltda [Member]
Penalties On Tax [Member]
BRL
Dec. 31, 2013
Minda Stoneridge Instruments Ltd [Member]
Dec. 31, 2012
Minda Stoneridge Instruments Ltd [Member]
Dec. 31, 2011
Minda Stoneridge Instruments Ltd [Member]
Short-term Debt [Line Items]                                              
Environmental remediation accrued undiscounted liability $ 944 $ 1,340 $ 683 $ 733                                      
Line of credit               2,000                              
Loss contingency, estimate of possible loss         11,469 11,469 11,925                                
Equity method investment, ownership percentage                         50.00% 50.00%             49.00% 49.00% 49.00%
Loss contingencies aggregate tax assessment not accrued                   $ 39,500 92,500       $ 5,600 13,200 $ 4,900 11,400 $ 29,000 67,900      
Percentage of state value added tax                         25.00%                    
Percentage ownership in consolidated subsidiary         74.00% 74.00%     74.00% 74.00% 74.00% 74.00%