INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current [Abstract]
Federal	$ 27,393	$ 15,401	$ 7,952
State	4,438	2,731	1,446
Foreign	963	0	0
Total current	32,794	18,132	9,398
Deferred [Abstract]
Deferred Federal Income Tax Expense (Benefit)	1,835	2,081	2,914
Deferred State and Local Income Tax Expense (Benefit)	146	345	439
Deferred Foreign Income Tax Expense (Benefit)	(751)	0	0
Deferred	1,230	2,426	3,353
Total	34,024	20,558	12,751
Federal statutory income tax rate (in hundredths)	35.00%
The difference between income taxes computed at the federal statutory income tax rate and the provision for income taxes [Abstract]
Income taxes computed at federal statutory rate	29,753	18,198	11,246
State income taxes, net of federal benefit	2,917	1,999	1,225
Other, primarily non-tax deductible items	1,354	361	280
Total	34,024	20,558	12,751
The net current and noncurrent components of deferred income tax balances [Abstract]
Net current assets	5,182	4,539
Net non-current assets	0	1,588
Net non-current liabilities	(16,448)	0
Net deferred tax asset (liability)	(11,266)	6,127
Deferred tax assets: [Abstract]
Goodwill	2,270	3,575
Allowance for doubtful accounts	2,408	2,077
Inventories	1,803	1,707
Accruals	842	889
Other	342	229
Total deferred tax assets	7,665	8,477
Less valuation allowance	0	0
Total deferred tax assets, net of valuation allowance	7,665	8,477
Deferred tax liabilities [Abstract]
Intangibles	(9,232)	(786)
Property and equipment	(8,430)	(1,421)
Unremitted foreign earnings	(577)	0
Cumulative translation adjustment	(298)	0
Other	(394)	(143)
Net deferred tax asset (liability)	$ (11,266)	$ 6,127