Debt (Details Textual) In Thousands, unless otherwise specified	6 Months Ended						6 Months Ended		12 Months Ended		6 Months Ended			6 Months Ended						6 Months Ended
	Jun. 30, 2013 USD ($)	Jun. 30, 2013 SEK	Dec. 31, 2012 USD ($)	Dec. 31, 2012 SEK	Nov. 02, 2007 USD ($)	Jun. 30, 2013 Minimum [Member] USD ($)	Jun. 30, 2013 Senior Notes [Member] USD ($)		Dec. 31, 2012 Senior Notes [Member] USD ($)	Oct. 04, 2010 Senior Notes [Member]	Jun. 30, 2013 Line of Credit [Member]	Jun. 30, 2013 Revolving Credit Facility [Member] USD ($)	Dec. 31, 2012 Revolving Credit Facility [Member] USD ($)	Jun. 30, 2013 Term Loan [Member]	Jun. 30, 2013 Term Loan One [Member] CNY	Jun. 30, 2013 Term Loan Two [Member] USD ($)	Jun. 30, 2013 Term Loan Two [Member] CNY	Dec. 31, 2012 Term Loan Two [Member] USD ($)	Oct. 13, 2009 Bolton Conductive Systems L L C [Member] USD ($)	Jun. 30, 2013 Pst Eletronica Ltda [Member] USD ($)	Jun. 30, 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.
Debt Instrument, Interest Rate, Stated Percentage																				5.50%	5.50%
Debt Instrument, Maturity Date							Oct. 15, 2017													Feb. 02, 2016	Feb. 02, 2016
Debt Instrument, Payment Terms														Interest is payable quarterly at 125.0% of the one-year lending rate published by The People's Bank of China.
Debt Instrument, Unamortized Discount, Percentage										2.50%
Line of Credit Facility, Commitment Fee Percentage	0.375%	0.375%
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,985	20,000	$ 3,075	20,000	$ 100,000							$ 83,891	$ 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)							3,022		3,296
Debt Instrument, Face Amount															9,000		9,000				25,000
Long-term Debt, Gross																1,466		1,445		11,309
Total long-term debt, net	188,429		181,311																	15,597
Long-term Debt, Weighted Average Interest Rate							9.50%	[1]
Long-term Debt, Maturities, Repayments of Principal in Year Two																				3,400
Long-term Debt, Maturities, Repayments of Principal in Year Three																				6,786
Long-term Debt, Maturities, Repayments of Principal in Year Five																				2,060
Long-term Debt, Maturities, Repayments of Principal after Year Five																				$ 1,117

[1] Weighted average interest rate excludes the impact of the Company's interest rate swap and the accretion of debt discount.