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Acquired Intangible Assets (Details) (USD $) | 3 Months Ended |  |  |  | 1 Months Ended | 3 Months Ended |  |  |  |  |  |  |  |
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Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Mar. 31, 2013 Customer Relationships [Member] | Dec. 31, 2012 Customer Relationships [Member] | Feb. 28, 2013 Customer Relationships [Member] SMP Europe [Member] | Mar. 31, 2013 Customer Relationships [Member] SMP Europe [Member] | Mar. 31, 2013 Trademarks and Trade Names [Member] | Dec. 31, 2012 Trademarks and Trade Names [Member] | Mar. 31, 2013 Non-compete Agreements [Member] | Dec. 31, 2012 Non-compete Agreements [Member] | Mar. 31, 2013 Patents and Supply Contracts [Member] | Dec. 31, 2012 Patents and Supply Contracts [Member] | Mar. 31, 2013 Leaseholds [Member] | Dec. 31, 2012 Leaseholds [Member]
Acquired Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total acquired intangible assets | $ 52,456,000 |  |  | $ 48,693,000 |  | $ 43,863,000 | $ 40,100,000 |  |  | $ 6,800,000 | $ 6,800,000 | $ 910,000 | $ 910,000 | $ 723,000 | $ 723,000 | $ 160,000 | $ 160,000
Less accumulated amortization | (15,547,000) | [1] |  | (14,210,000) | [1] |  |  |  |  |  |  |  |  |  |  |  |
Net acquired intangible assets | 36,909,000 |  |  | 34,483,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of acquired indefinite-lived intangible assets |  |  |  |  |  |  |  |  |  | 5,200,000 |  |  |  |  |  |  |
Amount of acquired intangible assets |  |  |  |  |  |  |  |  | 3,800,000 |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  |  |  |  |  | 10 years | 10 years |  |  |  |  |  |  |  |
Amortization of acquired intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense | 1,300,000 |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense, remainder of current year | 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense in year 2014 | 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense in year 2015 | 4,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense in years 2016 through 2028 | $ 19,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Applies to all intangible assets, except for trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.

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