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LONG-TERM DEBT (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Line of Credit [Member] | Dec. 31, 2012 Line of Credit [Member] | Dec. 31, 2013 Term Loan [Member] | Dec. 31, 2012 Term Loan [Member] | Dec. 31, 2013 Promissory Note Payable [Member] | Dec. 31, 2012 Promissory Note Payable [Member] | Dec. 31, 2013 Unsecured Subordinated Notes Payable [Member] | Dec. 31, 2012 Unsecured Subordinated Notes Payable [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] | Jul. 11, 2012 Wells Fargo Bank, National Association [Member] Line of Credit [Member] | Dec. 31, 2013 Wells Fargo Bank, National Association [Member] Term Loan [Member] | Dec. 31, 2013 Wells Fargo Bank, National Association [Member] Term Loan [Member] LIBOR [Member] | Dec. 31, 2012 Wells Fargo Bank, National Association [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 Wells Fargo Bank, National Association [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 Wells Fargo Bank, National Association [Member] Revolving Credit Facility [Member] Minimum [Member] | Dec. 31, 2013 Wells Fargo Bank, National Association [Member] Revolving Credit Facility [Member] Maximum [Member] | Dec. 31, 2013 Wells Fargo Bank, National Association [Member] Revolving Credit Facility [Member] LIBOR [Member] | Dec. 31, 2013 Wells Fargo Bank, National Association [Member] Revolving Credit Facility [Member] LIBOR [Member] Minimum [Member] | Dec. 31, 2013 Wells Fargo Bank, National Association [Member] Revolving Credit Facility [Member] LIBOR [Member] Maximum [Member] | Dec. 31, 2013 Wells Fargo Bank, National Association [Member] Revolving Credit Facility [Member] Prime rate [Member] | Dec. 31, 2013 Wells Fargo Bank, National Association [Member] Revolving Credit Facility [Member] Prime rate [Member] Minimum [Member] | Dec. 31, 2013 Wells Fargo Bank, National Association [Member] Revolving Credit Facility [Member] Prime rate [Member] Maximum [Member]
Borrowings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 194,585,000 | $ 238,396,000 |  | $ 76,849,000 | $ 104,526,000 | $ 109,375,000 | $ 130,000,000 | $ 6,000,000 | $ 0 | $ 2,361,000 | $ 3,870,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt | (26,213,000) | (22,057,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | 168,372,000 | 216,339,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | 262,500,000 | 109,400,000 |  |  |  |  |  |  |  |  |  |  |
Increase in borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  |  |  |  |  |  |  |  |
Base rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  | LIBOR |  |  | prime |  |
Basis spread on base rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75% |  |  |  |  | 1.50% | 1.25% | 2.25% | 0.50% | 0.25% | 1.25%
Incremental basis points for term loan (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |
Commitment fee (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  | 0.20% | 0.40% |  |  |  |  |  |
Incremental higher interest rate after acquisition (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.70% |  |  |  |  |  |  |  |  |
Debt issuance costs expensed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 186,200,000 |  |  |  |  |
Available for borrowing under the facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 154,100,000 |  |  |  |  |  |  |  |
Weighted average interest rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.80% |  |  |  |  |
Monthly installments (in hundredths) |  |  |  |  |  |  |  | 2.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly installments (in hundredths) |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum consolidated leverage ratio required through March 31, 2015 |  |  |  |  |  |  |  |  |  |  |  | 3.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum consolidated leverage ratio required from June 30, 2015 and thereafter |  |  |  |  |  |  |  |  |  |  |  | 3.25 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum asset coverage ratio |  |  |  |  |  |  |  |  |  |  |  | 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio | 1.48 |  |  |  |  |  |  |  |  |  |  | 1.48 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum consolidated fixed charge coverage ratio |  |  |  |  |  |  |  |  |  |  |  | 1.25 |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  |  |  |  |  |  |  | 2.84 |  |  |  |  |  |  |  |  |  |  |  |  |
Asset coverage ratio |  |  |  |  |  |  |  |  |  |  |  | 2.99 |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |
Computation of the Leverage Ratio [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income before taxes | 94,717,000 | 85,009,000 | 51,995,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | 6,282,000 | 5,560,000 | 3,518,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization | 21,660,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense | 2,832,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma acquisition EBITDA | 6,612,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other adjustments | (351,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined EBITDA | 131,752,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined indebtedness | 194,585,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage Ratio (B)/(A) | 1.48 |  |  |  |  |  |  |  |  |  |  | 1.48 |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 26,213,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 32,672,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 35,204,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 97,701,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 879,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | $ 1,916,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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