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Debt (Narrative) (Details)	9 Months Ended			9 Months Ended							9 Months Ended		9 Months Ended									9 Months Ended			9 Months Ended
	Sep. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)	Nov. 02, 2007 USD ($)	Sep. 30, 2013 Maximum [Member]	Sep. 30, 2013 Minimum [Member] USD ($)	Sep. 30, 2013 Senior Notes [Member] USD ($)		Dec. 31, 2012 Senior Notes [Member] USD ($)	Oct. 04, 2010 Senior Notes [Member]	Sep. 30, 2013 Senior Notes [Member] Reeemable After October 15, 2014 [Member]	Sep. 30, 2013 Revolving Credit Facility [Member] USD ($)	Dec. 31, 2012 Revolving Credit Facility [Member] USD ($)	Sep. 30, 2013 Revolving Credit Facility [Member] Maximum [Member]	Sep. 30, 2013 Revolving Credit Facility [Member] Minimum [Member]	Sep. 30, 2013 Bolton Conductive Systems L L C [Member] Revolving Credit Facility [Member] USD ($)	Sep. 30, 2013 Subsidiary[Member] USD ($)	Sep. 30, 2013 Subsidiary[Member] SEK	Dec. 31, 2012 Subsidiary[Member] USD ($)	Sep. 30, 2013 Subsidiary[Member] Term Loan [Member] USD ($)	Aug. 21, 2013 Subsidiary[Member] Term Loan [Member] CNY	Dec. 31, 2012 Subsidiary[Member] Term Loan [Member] USD ($)	Sep. 30, 2013 Subsidiary[Member] Term Loan One [Member] USD ($)	Dec. 31, 2012 Subsidiary[Member] Term Loan One [Member] USD ($)	Aug. 29, 2012 Subsidiary[Member] Term Loan One [Member] CNY	Sep. 30, 2013 PST Eletrnica Ltda. [Member] Term Loan [Member] USD ($)	Sep. 30, 2013 PST Eletrnica Ltda. [Member] Term Loan [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.
Debt instrument, basis spread on variable rate				1.75%	1.00%						0.50%		0.25%	0.00%
Debt instrument, interest rate as a percent of reference rate																						125.00%
Fixed interest rate																									5.50%	5.50%
Debt instrument, maturity date						Oct. 15, 2017																			Feb. 02, 2016	Feb. 02, 2016
Credit Facility covenat compliance	The Company was in compliance with all Credit Facility covenants at September 30, 2013 and December 31, 2012
Debt instrument, unamortized discount, percentage									2.50%
Line of credit facility, commitment fee percentage											0.375%
Undrawn borrowing capacity											$ 83,636,000	$ 74,060,000
Line of credit facility, maximum borrowing capacity			100,000,000												3,000,000	3,111,000	20,000,000	3,075,000
Line of credit, current																			0		0
Secured long-term debt, noncurrent						175,000,000		175,000,000
Debt early redemption premium										104.75%
Line of credit facility covenant limits	15,000,000				20,000,000
Unamortized debt discount						2,878,000		3,296,000
Debt instrument, face amount																				9,000,000				9,000,000		25,000,000
Long-term debt, gross																						1,470,000	1,445,000		11,236,000
Total long-term debt, net	187,452,000	181,311,000																							14,032,000
Long-term Debt, Weighted Average Interest Rate						9.50%	[1]
Long-term debt, maturities, repayments of principal in year two																									1,717,000
Long-term debt, maturities, repayments of principal in year three																									6,854,000
Long-term debt, maturities, repayments of principal in year four																									2,131,000
Long-term debt, maturities, repayments of principal in year five																									1,110,000
Long-term debt, maturities, repayments of principal after year five																									$ 1,110,000
[1] Weighted average interest rate excludes the effect of the Company's interest rate swap and the accretion of debt discount.

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Debt early redemption premium

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Debt instrument, interest rate as a percent of reference rate

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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.

+ References

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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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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or 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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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the 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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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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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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Identification of whether the entity has been in compliance with any credit facility debt covenants during the period.

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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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 fourth 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 second fiscal year following the latest fiscal year.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Weighted average interest rate of long-term debt outstanding.

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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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