CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 50,985	$ 31,437	$ 19,381
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	7,196	3,510	3,744
Amortization of Intangible Assets	10,886	6,572	5,824
Gain on sale of equipment	0	0	(188)
Write-off of debt issuance costs	654	0	0
Compensation expense for restricted stock	1,955	1,256	973
Tax benefit related to vesting of restricted stock	(680)	(198)	(215)
Deferred income taxes	1,230	2,426	3,353
Changes in operating assets and liabilities, net of assets and liabilities acquired in business acquisitions:
Trade accounts receivable	(1,978)	(21,548)	(14,528)
Inventories	(3,470)	(4,258)	2,028
Prepaid expenses and other assets	(2,211)	(2,617)	1,165
Accounts payable and accrued expenses	(13,361)	9,248	2,371
Net cash provided by operating activities	51,206	25,828	23,908
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(14,110)	(4,096)	(1,184)
Proceeds from the sale of equipment	0	0	1,428
Purchase of long-term investment	(105)	(1,572)	0
Acquisitions of businesses, net of cash acquired	(144,879)	(18,434)	(18,394)
Net cash used in investing activities	(159,094)	(24,102)	(18,150)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from debt	465,163	224,307	141,216
Principal payments on revolving line of credit and other long-term debt	(345,231)	(223,959)	(148,798)
Dividends paid	(90)	(90)	(90)
Purchase of treasury stock	(3,422)	(1,445)	0
Proceeds from exercise of stock options	0	0	125
Tax benefit related to vesting of restricted stock	680	198	215
Net cash provided by (used in) financing activities	117,100	(989)	(7,332)
EFFECT OF FOREIGN CURRENCY ON CASH	(264)	0	0
INCREASE (DECREASE) IN CASH	8,948	737	(1,574)
CASH AT BEGINNING OF YEAR	1,507	770	2,344
CASH AT END OF YEAR	10,455	1,507	770
Supplemental Cash Flow Information [Abstract]
Cash paid for Interest	4,285	3,490	5,240
Cash paid for Income Taxes	32,311	14,190	8,342
Cash received from Income Tax Refunds	$ 380	$ 293	$ 250