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ACQUISITIONS (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Acquisition Date Fair Values (As finalized) [Member] | Jun. 30, 2014 Class A [Member] | Jun. 30, 2013 Class A [Member] | Jun. 30, 2014 Class A [Member] | Jun. 30, 2013 Class A [Member] | Jun. 30, 2014 Class B [Member] | Jun. 30, 2013 Class B [Member] | Jun. 30, 2014 Class B [Member] | Jun. 30, 2013 Class B [Member] | Jun. 19, 2014 Power Solutions [Member] | Jun. 19, 2014 Power Solutions [Member] | Jun. 30, 2014 Power Solutions [Member] | Jun. 30, 2013 Power Solutions [Member] | Jun. 30, 2014 Power Solutions [Member] | Jun. 30, 2013 Power Solutions [Member] | Jun. 30, 2014 Power Solutions [Member] Class A [Member] | Jun. 30, 2013 Power Solutions [Member] Class A [Member] | Jun. 30, 2014 Power Solutions [Member] Class A [Member] | Jun. 30, 2013 Power Solutions [Member] Class A [Member] | Jun. 30, 2014 Power Solutions [Member] Class B [Member] | Jun. 30, 2013 Power Solutions [Member] Class B [Member] | Jun. 30, 2014 Power Solutions [Member] Class B [Member] | Jun. 30, 2013 Power Solutions [Member] Class B [Member] | Mar. 29, 2013 TRP [Member] | Mar. 29, 2013 TRP [Member] Acquisition Date Fair Values [Member] | Mar. 29, 2013 TRP [Member] Measurement Period Adjustments [Member] | Aug. 20, 2013 Array [Member] | Aug. 20, 2013 Array [Member] Acquisition Date Fair Values [Member] | Aug. 20, 2013 Array [Member] Measurement Period Adjustments [Member] | Jun. 30, 2014 2013 Acquired Companies [Member] | Jun. 30, 2013 2013 Acquired Companies [Member] | Jun. 30, 2014 2013 Acquired Companies [Member] | Jun. 30, 2013 2013 Acquired Companies [Member]
Acquired assets and liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for acquisitions, net of cash acquired |  |  | $ 109,879,000 | $ 20,932,000 |  |  |  |  |  |  |  |  |  |  |  | $ 110,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,000,000 |  |  | $ 10,000,000 |  |  |  |  |  |
Acquisition-related costs | 400,000 |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 300,000 | 100,000 | 700,000
Percentages of owned joint venture investment (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | 99,439,000 | 93,981,000 | 182,085,000 | 157,009,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,200,000 |  | 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,700,000 | 22,200,000 | 37,600,000 | 22,200,000
Net earnings (loss) | 3,065,000 | 1,689,000 | 5,568,000 | 1,131,000 |  |  | 545,000 | 299,000 | 987,000 | 187,000 | 2,520,000 | 1,390,000 | 4,581,000 | 944,000 |  |  |  | (800,000) |  | (800,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,700,000 | 3,300,000 | 4,800,000 | 3,300,000
Acquisition-related costs excluded from pro forma net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs incurred but excluded from pro forma earnings during the period after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonrecurring expense related to fair value adjustments excluded from pro forma net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  | 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value adjustments excluded from pro form net earnings after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  | 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | 8,388,000 |  |  |  |  |  |  |  |  |  | 20,913,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,388,000 | 8,388,000 | 0 | 0 | 0 | 0 |  |  |  |
Accounts receivable |  |  |  |  |  | 12,535,000 |  |  |  |  |  |  |  |  |  | 29,388,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,580,000 | 11,541,000 | (39,000) | 994,000 | 994,000 | 0 |  |  |  |
Inventories | 33,400,000 |  | 33,400,000 |  |  | 8,348,000 |  |  |  |  |  |  |  |  |  | 33,156,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  | 6,258,000 | 7,355,000 | 1,097,000 | 2,588,000 | 993,000 | (1,595,000) |  |  |  |
Other current assets |  |  |  |  |  | 2,047,000 |  |  |  |  |  |  |  |  |  | 5,387,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,953,000 | 1,619,000 | (334,000) | 83,000 | 428,000 | 345,000 |  |  |  |
Property, plant and equipment |  |  |  |  |  | 9,300,000 |  |  |  |  |  |  |  |  |  | 28,176,000 | [2] |  |  |  |  |  |  |  |  |  |  |  |  | 4,693,000 | 5,790,000 | 1,097,000 | 2,285,000 | 3,510,000 | 1,225,000 |  |  |  |
Intangible assets |  |  |  |  |  | 7,580,000 |  |  |  |  |  |  |  |  |  | 21,188,000 | [3] |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 6,110,000 | 6,110,000 | 0 | 1,470,000 | 1,470,000 |  |  |  |
Other assets |  |  |  |  |  | 3,096,000 |  |  |  |  |  |  |  |  |  | 536,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,151,000 | 1,349,000 | 198,000 | 84,000 | 1,747,000 | 1,663,000 |  |  |  |
Total identifiable assets |  |  |  |  |  | 51,294,000 |  |  |  |  |  |  |  |  |  | 138,744,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,023,000 | 42,152,000 | 8,129,000 | 6,034,000 | 9,142,000 | 3,108,000 |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  |  | (8,910,000) |  |  |  |  |  |  |  |  |  | (26,180,000) |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,565,000) | (8,234,000) | 331,000 | (677,000) | (676,000) | 1,000 |  |  |  |
Accrued expenses |  |  |  |  |  | (4,750,000) |  |  |  |  |  |  |  |  |  | (20,290,000) |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,003,000) | (4,465,000) | (462,000) | (206,000) | (285,000) | (79,000) |  |  |  |
Income taxes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 223,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liability, noncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 860,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (99,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities |  |  |  |  |  | (759,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (25,000) | (759,000) | (734,000) | (214,000) | 0 | 214,000 |  |  |  |
Noncurrent liabilities |  |  |  |  |  | (2,334,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (586,000) | (586,000) | (643,000) | (1,748,000) | (1,105,000) |  |  |  |
Total liabilities assumed |  |  |  |  |  | (16,753,000) |  |  |  |  |  |  |  |  |  | (45,486,000) |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,593,000) | (14,044,000) | (1,451,000) | (1,740,000) | (2,709,000) | (969,000) |  |  |  |
Net identifiable assets acquired |  |  |  |  |  | 34,541,000 |  |  |  |  |  |  |  |  |  | 93,258,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,430,000 | 28,108,000 | 6,678,000 | 4,294,000 | 6,433,000 | 2,139,000 |  |  |  |
Goodwill | 55,644,000 |  | 55,644,000 |  | 18,490,000 | 4,812,000 |  |  |  |  |  |  |  |  |  | 37,534,000 | [4] |  |  |  |  |  |  |  |  |  |  |  |  | 8,278,000 | 1,240,000 | (7,038,000) | 5,666,000 | 3,572,000 | (2,094,000) |  |  |  |
Net assets acquired |  |  |  |  |  | 39,353,000 |  |  |  |  |  |  |  |  |  | 130,792,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,708,000 | 29,348,000 | (360,000) | 9,960,000 | 10,005,000 | 45,000 |  |  |  |
Consideration transferred [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Paid |  |  |  |  |  | 39,353,000 |  |  |  |  |  |  |  |  | 130,792,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,400,000 | 29,348,000 | 6,948,000 | 9,960,000 | 10,005,000 | 45,000 |  |  |  |
Assumption of severance payment |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109,000 | 0 | (109,000) | 0 | 0 | 0 |  |  |  |
Fair value of consideration transferred |  |  |  |  |  | 39,353,000 |  |  |  |  |  |  |  |  | 130,792,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,509,000 | 29,348,000 | 6,839,000 | 9,960,000 | 10,005,000 | 45,000 |  |  |  |
Deferred consideration |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,199,000 | 0 | (7,199,000) | 0 | 0 | 0 |  |  |  |
Total consideration paid |  |  |  |  |  | 39,353,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,708,000 | 29,348,000 | (360,000) | 9,960,000 | 10,005,000 | 45,000 |  |  |  |
Unaudited Pro forma Consolidated Results of Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 136,984,000 | 161,481,000 | 278,451,000 | 305,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (3,336,000) | $ 1,382,000 | $ 233,000 | $ (5,977,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings per common share - basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.28) | $ 0.11 | $ 0.01 | $ (0.51) | $ (0.29) | $ 0.12 | $ 0.02 | $ (0.53) |  |  |  |  |  |  |  |  |  |
[1] | The determination of fair value related to the inventory acquired was still in progress as of the date of this filing. The amount above represents only the carrying value of the inventory on Power Solutions’ balance sheet as of the acquisition date.
[2] | The appraisals related to machinery and equipment acquired were incomplete as of this filing date and, as such, the amount noted above represents only the carrying value of those assets on Power Solutions’ balance sheet as of the acquisition date.
[3] | The Company has identified certain intangible assets related to the Power Solutions acquisition, including trademarks and trade names, developed technology and potential in-process research and development, license agreements, non-compete agreements, an investment in a 49%-owned joint venture and customer relationships, which are being valued by a third-party appraiser. These appraisals were not complete as of the date of this filing.
[4] | The amount of goodwill is provisional as of the filing date, as the fair value determination of inventory acquired, and appraisals related to property, plant and equipment, various intangible assets and certain liabilities such as lease liabilities are still underway. As the final amount of goodwill has not yet been determined or allocated by segment, the Company is unable to determine at this time the portion of goodwill, if any, that will be deductible for tax purposes

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