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BUSINESS SEGMENT INFORMATION, , Entity Wide Information (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 Customer | Dec. 31, 2012 Customer | Dec. 31, 2011 Customer
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales | $ 91,016,000 | $ 101,164,000 | [1] | $ 93,981,000 | [1] | $ 63,028,000 | $ 71,752,000 | [2] | $ 76,059,000 | $ 73,222,000 | [2] | $ 65,561,000 | $ 349,189,000 | [3] | $ 286,594,000 | [3] | $ 295,121,000
Long-lived Assets by Geographic Location [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 54,344,000 |  |  |  |  |  | 47,512,000 |  |  |  |  |  | 54,344,000 |  | 47,512,000 |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers representing sales in excess of ten percent |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  | 2 |  | 2
Revenue from major customers, percentage (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 29.60% |  | 24.60% |  | 22.30%
Two Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from major customers |  |  |  |  |  |  |  |  |  |  |  |  | 103,300,000 |  | 70,600,000 |  | 65,700,000
TRP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 66,100,000 |  |  |  |
Array [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |  |
Fibreco and Bel Power Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 10,700,000 |  | 3,100,000 |  |
Interconnect [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 111,653,000 |  | 109,245,000 |  | 107,346,000
Magnetics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 170,166,000 |  | 100,529,000 |  | 87,104,000
Modules [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 55,967,000 |  | 66,663,000 |  | 90,475,000
Circuit protection [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 11,403,000 |  | 10,157,000 |  | 10,196,000
North America [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 128,472,000 |  | 138,966,000 |  | 149,114,000
Asia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 225,151,000 |  | 167,756,000 |  | 177,815,000
Long-lived Assets by Geographic Location [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of identifiable assets (in hundredths) | 40.00% |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |
Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 40,742,000 |  | 33,329,000 |  | 34,597,000
Intergeographic revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | (45,176,000) |  | (53,457,000) |  | (66,405,000)
United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 116,548,000 |  | 126,469,000 |  | 134,804,000
Long-lived Assets by Geographic Location [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 30,102,000 |  |  |  |  |  | 27,552,000 |  |  |  |  |  | 30,102,000 |  | 27,552,000 |  |
Macao [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 193,647,000 |  | 128,319,000 |  | 126,941,000
Germany [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 16,585,000 |  | 14,165,000 |  | 17,937,000
United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 16,538,000 |  | 13,203,000 |  | 11,927,000
Italy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 3,252,000 |  | 1,083,000 |  | 0
Sweden [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 4,000 |  | 57,000 |  | 0
Czech Republic [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 2,615,000 |  | 3,298,000 |  | 3,512,000
People's Republic of China (PRC) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived Assets by Geographic Location [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 20,985,000 |  |  |  |  |  | 16,622,000 |  |  |  |  |  | 20,985,000 |  | 16,622,000 |  |
All other foreign countries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived Assets by Geographic Location [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | $ 3,257,000 |  |  |  |  |  | $ 3,338,000 |  |  |  |  |  | $ 3,257,000 |  | $ 3,338,000 |  |
[1] | The net earnings for the quarters ended June 30, 2013 and September 30, 2013 have been restated to include the effects of measurement period adjustments related to the acquisitions of TRP and Array. These measurement period adjustments reduced the previously-reported net earnings by $0.7 million and $0.5 million for the quarters ended June 30, 2013 and September 30, 2013, respectively, and primarily related to the step-up of inventory to fair value, and higher depreciation and amortization expense related to the appraised fair values of property, plant and equipment, and the various intangible assets as further described in Note 2.
[2] | The net loss for the quarter ended December 31, 2012 includes $3.1 million of restructuring charges primarily related to severance charges and the write-down of assets associated with the closure of the Company’s Vinita, Oklahoma manufacturing facility.
[3] | Quarterly amounts of earnings per share may not agree to the total for the year due to rounding.

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