LONG-TERM DEBT (Details) (USD $)	12 Months Ended											12 Months Ended		12 Months Ended				12 Months Ended					12 Months Ended
	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