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BUSINESS SEGMENT 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 Industry Segment | Dec. 31, 2012 Segment Industry | Dec. 31, 2011 Industry Segment
BUSINESS SEGMENT INFORMATION [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of industry in which entity operates |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 1 |  | 1
Number of reportable operating segments |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 3 |  | 3
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  |  |  |  |  | $ 349,189,000 |  | $ 286,594,000 |  | $ 295,121,000
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
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | 15,047,000 |  | 1,663,000 |  | 7,396,000
Total assets | 308,050,000 |  |  |  |  |  | 275,189,000 |  |  |  |  |  | 308,050,000 |  | 275,189,000 |  | 276,911,000
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 6,940,000 |  | 4,744,000 |  | 2,928,000
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  |  |  |  | 12,382,000 |  | 9,113,000 |  | 8,667,000
Restructuring charges |  |  |  |  |  |  | 3,100,000 |  |  |  |  |  | 1,387,000 |  | 5,245,000 |  | 314,000
Litigation charges |  |  |  |  |  |  |  |  |  |  |  |  | (41,000) |  | (26,000) |  | (3,471,000)
Loss on disposal of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |
Pre-tax gain on sale of property |  |  |  |  |  |  |  |  |  |  |  |  | 69,000 |  | (183,000) |  | 93,000
TRP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 66,100,000 |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | 10,900,000 |  |  |  |
Array [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | (900,000) |  |  |  |
Fibreco and Bel Power Europe Combined [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 10,700,000 |  | 3,100,000 |  |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  | 300,000 |  |
Interconnect [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 111,653,000 |  | 109,245,000 |  | 107,346,000
Magnetics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 170,166,000 |  | 100,529,000 |  | 87,104,000
Modules [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 55,967,000 |  | 66,663,000 |  | 90,475,000
Circuit protection [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 11,403,000 |  | 10,157,000 |  | 10,196,000
North America [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  |  |  |  |  | 116,548,000 |  | 126,469,000 |  | 134,804,000
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 128,472,000 |  | 138,966,000 |  | 149,114,000
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | (1,560,000) |  | 1,336,000 |  | 9,026,000
Total assets | 117,261,000 |  |  |  |  |  | 84,609,000 |  |  |  |  |  | 117,261,000 |  | 84,609,000 |  | 115,552,000
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 2,064,000 |  | 2,455,000 |  | 1,121,000
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  |  |  |  | 4,282,000 |  | 4,081,000 |  | 4,046,000
Restructuring charges |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  | 4,500,000 |  |
Loss on disposal of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (300,000) |  |
Asia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  |  |  |  |  | 193,647,000 |  | 128,319,000 |  | 126,941,000
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 225,151,000 |  | 167,756,000 |  | 177,815,000
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | 15,356,000 |  | (42,000) |  | (3,480,000)
Total assets | 148,689,000 |  |  |  |  |  | 148,351,000 |  |  |  |  |  | 148,689,000 |  | 148,351,000 |  | 148,950,000
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 4,551,000 |  | 2,003,000 |  | 1,733,000
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  |  |  |  | 6,540,000 |  | 4,076,000 |  | 4,137,000
Restructuring charges |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  | 600,000 |  |
Litigation charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000
Pre-tax gain on sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |
Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  |  |  |  |  | 38,994,000 |  | 31,806,000 |  | 33,376,000
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 40,742,000 |  | 33,329,000 |  | 34,597,000
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | 1,251,000 |  | 369,000 |  | 1,850,000
Total assets | 42,100,000 |  |  |  |  |  | 42,229,000 |  |  |  |  |  | 42,100,000 |  | 42,229,000 |  | 12,409,000
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 325,000 |  | 286,000 |  | 74,000
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  |  |  |  | 1,560,000 |  | 956,000 |  | 484,000
Restructuring charges |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  | 100,000 |  | 300,000
Intergeographic revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | (45,176,000) |  | (53,457,000) |  | (66,405,000)
United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 116,548,000 |  | 126,469,000 |  | 134,804,000
Macao [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 193,647,000 |  | 128,319,000 |  | 126,941,000
Germany [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 16,585,000 |  | 14,165,000 |  | 17,937,000
United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 16,538,000 |  | 13,203,000 |  | 11,927,000
Italy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 3,252,000 |  | 1,083,000 |  | 0
Sweden [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 4,000 |  | 57,000 |  | 0
Czech Republic [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of key financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,615,000 |  | $ 3,298,000 |  | $ 3,512,000
[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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