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Long-Term Debt (Details Textual) In Thousands, unless otherwise specified	3 Months Ended					3 Months Ended		12 Months Ended		3 Months Ended				3 Months Ended						3 Months Ended
	Mar. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2012 SEK	Nov. 02, 2007 USD ($)	Mar. 31, 2013 Minimum [Member] USD ($)	Mar. 31, 2013 Senior Notes [Member] USD ($)		Dec. 31, 2012 Senior Notes [Member] USD ($)	Oct. 04, 2010 Senior Notes [Member]	Mar. 31, 2013 Line Of Credit [Member]	Mar. 31, 2013 Line Of Credit [Member] Federal Funds Rate [Member]	Mar. 31, 2013 Revolving Credit Facility [Member] USD ($)	Dec. 31, 2012 Revolving Credit Facility [Member] USD ($)	Mar. 31, 2013 Term Loan [Member]	Mar. 31, 2013 Term Loan One [Member] CNY	Mar. 31, 2013 Term Loan Two [Member] USD ($)	Mar. 31, 2013 Term Loan Two [Member] CNY	Dec. 31, 2012 Term Loan Two [Member] USD ($)	Oct. 13, 2009 Bolton Conductive Systems L L C [Member] USD ($)	Mar. 31, 2013 Pst Eletronica Ltda [Member] USD ($)	Mar. 31, 2013 Pst Eletronica Ltda [Member] BRL
Debt Instrument, Description of Variable Rate Basis										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.	Federal Funds rate plus 0.50%
Debt Instrument, Interest Rate, Stated Percentage																				5.50%	5.50%
Debt Instrument, Maturity Date																				Feb. 15, 2016	Feb. 15, 2016
Debt Instrument, Payment Terms														Interest is payable quarterly at the one-year lending rate published by The People's Bank of China multiplied by 125.0%.
Debt Instrument, Unamortized Discount, Percentage									2.50%
Line of Credit Facility, Commitment Fee Percentage	0.375%
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,064	$ 3,075	20,000	$ 100,000								$ 85,097	$ 74,060
Line of Credit, Current																			3,000
Secured Long-term Debt, Noncurrent						175,000		175,000
Debt Instrument Redeemable Percentage									104.75%
Line Of Credit Facility Covenant Limits	15,000				20,000
Amortization of Debt Discount (Premium)						3,161		3,296
Debt Instrument, Face Amount															9,000		9,000				25,000
Long-term Debt, Gross																1,449		1,445		12,420
Total long-term debt, net	193,531	181,311																		19,515
Long-term Debt, Weighted Average Interest Rate	9.50%					9.50%	[1]
Long-term Debt, Maturities, Repayments of Principal in Year Two																				6,114
Long-term Debt, Maturities, Repayments of Principal in Year Three																				7,449
Long-term Debt, Maturities, Repayments of Principal in Year Five																				2,265
Long-term Debt, Maturities, Repayments of Principal after Year Five																				$ 1,229
[1] Weighted average interest rate excludes the impact of the Company's interest rate swap and the accretion of debt discount.

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The percentage of debt instruments redeemable during the period.

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The percentage of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount of limits on investment activities due to credit facility debt covenants as of balance sheet date.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Interest rate stated in the contractual debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.

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Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

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