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LONG-TERM DEBT (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  |
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Jul. 11, 2012 | Dec. 31, 2011 | Sep. 30, 2012 Revolving Credit Facility [Member] | Sep. 30, 2012 Revolving Credit Facility [Member] | Sep. 30, 2012 Revolving Credit Facility [Member] | Dec. 31, 2011 Revolving Credit Facility [Member] | Sep. 30, 2012 Revolving Credit Facility [Member] Minimum [Member] | Sep. 30, 2012 Revolving Credit Facility [Member] Maximum [Member] | Sep. 30, 2012 Revolving Credit Facility [Member] LIBOR [Member] | Sep. 30, 2012 Revolving Credit Facility [Member] LIBOR [Member] Minimum [Member] | Sep. 30, 2012 Revolving Credit Facility [Member] LIBOR [Member] Maximum [Member] | Sep. 30, 2012 Revolving Credit Facility [Member] Prime rate [Member] | Sep. 30, 2012 Revolving Credit Facility [Member] Prime rate [Member] Minimum [Member] | Sep. 30, 2012 Revolving Credit Facility [Member] Prime rate [Member] Maximum [Member] | Jul. 11, 2012 Wells Fargo Bank, National Association [Member] Term Loan [Member] | Jul. 11, 2012 Wells Fargo Bank, National Association [Member] Revolving Credit Facility [Member] | Dec. 31, 2011 Wells Fargo Bank, National Association [Member] Revolving Credit Facility [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 325,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 | $ 225,000,000 | $ 200,000,000
Base rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  | prime |  |  |  |  |
Basis spread on base rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75% | 1.25% | 2.25% | 0.75% | 0.25% | 1.25% |  |  |
Incremental basis points for term loan (in hundredths) |  |  |  |  |  |  |  |  | 0.25% |  | 0.25% |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee (in hundredths) |  |  |  |  |  |  |  |  |  |  | 0.30% |  |  |  |  |  | 0.20% | 0.40% |  |  |  |  |  |  |  |  |
Incremental higher interest rate after acquisition (in hundredths) |  |  |  |  |  |  |  |  |  |  | 0.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs expensed |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 240,400,000 |  |  | 12,800,000 |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.09% |  |  | 3.75% |  |  |  |  |
Expiration date |  |  |  |  |  |  |  |  |  |  | Jul. 11, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum consolidated leverage ratio required through March 31, 2015 |  |  |  |  |  |  |  |  |  |  | 3.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum consolidated leverage ratio required from June 30, 2015 and thereafter |  |  |  |  |  |  |  |  |  |  | 3.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage Ratio |  |  |  |  |  |  |  |  | 2.12 |  | 2.12 |  | 2.12 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum consolidated fixed charge coverage ratio |  |  |  |  |  |  |  |  |  |  | 1.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  |  |  |  | 3.65 |  | 3.65 |  | 3.65 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum asset coverage ratio |  |  |  |  |  |  |  |  |  |  | 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of net accounts receivable for calculating asset coverage ratio (in hundredths) |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of net inventory for calculating asset coverage ratio (in hundredths) |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset coverage ratio |  |  |  |  |  |  |  |  | 1.43 |  | 1.43 |  | 1.43 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Computation of the Leverage Ratio [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income before taxes | 22,248,000 | 13,680,000 | 61,421,000 |  | 36,844,000 |  |  |  |  |  |  |  | 76,572,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | (2,287,000) | (760,000) | (3,878,000) |  | (2,805,000) |  |  |  |  |  |  |  | 4,591,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 15,670,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 1,818,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma acquisition EBITDA |  |  |  |  |  |  |  |  |  |  |  |  | 23,869,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other adjustments |  |  |  |  |  |  |  |  |  |  |  |  | (218,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
(A) Defined EBITDA |  |  |  |  |  |  |  |  |  |  |  |  | 122,302,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | 259,031,000 |  | 259,031,000 |  |  |  | 114,899,000 | [1] | 259,031,000 |  | 259,031,000 |  | 259,031,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  |  |  | 460,000 |  | 460,000 |  | 460,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
(B) Defined indebtedness |  |  |  |  |  |  |  |  | 259,491,000 |  | 259,491,000 |  | 259,491,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage Ratio (B)/(A) |  |  |  |  |  |  |  |  | 2.12 |  | 2.12 |  | 2.12 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt | 18,098,000 |  | 18,098,000 |  |  |  | 694,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, less current portion | 240,933,000 |  | 240,933,000 |  |  |  | 114,205,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | 259,031,000 |  | 259,031,000 |  |  |  | 114,899,000 | [1] | 259,031,000 |  | 259,031,000 |  | 259,031,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount available |  |  |  |  |  |  |  |  | 67,376,000 | [2] | 67,376,000 | [2] | 67,376,000 | [2] | 78,201,000 | [1],[2] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in current portion of long-term debt |  |  | 17,404,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in long-term debt, less current maturities |  |  | 126,728,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in total long-term debt |  |  | 144,132,000 | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in amount available |  |  |  |  |  |  |  |  |  |  | $ (10,825,000) | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Borrowings as of December 31, 2011 were primarily under the Company's previous credit facility which was terminated and replaced with the current credit facility on July 11, 2012.
[2] | Represents amount available to be borrowed at the indicated date under the Facility.
[3] | The funds obtained from the increase in debt were primarily used to fund acquisitions.
[4] | The $10.8 million decrease in the amount available is primarily a result of borrowing to fund acquisitions, partially offset by cash flow from operations.

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- Definition Earnings before interest, taxes, depreciation, and amortization. It measures a company's financial performance by computing earnings from core business operations, without including the effects of capital structure, tax rates and depreciation policies. It is used as a proxy for a company's operating cash flow and is not defined under GAAP. EBITDA is often used to value a company, with the enterprise value of a company calculated as a multiple of its EBITDA. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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