CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash Flows From Operating Activities
Net income	$ 6,323	$ 2,774
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,884	9,418
Provision for deferred income taxes	1,585	2,514
Net tax benefit related to stock option exercises		92
Excess tax benefit related to stock option exercises	(260)	(141)
Non-cash stock-based compensation	1,220	1,502
Decrease in earnout liability		(107)
Change in operating assets and liabilities:
Accounts receivable	9,390	5,325
Inventories	20,383	13,893
Prepaid expenses and other current assets	(5,476)	(3,792)
Other assets	(3,091)	207
Accounts payable	(6,599)	(1,115)
Accrued expenses and other current liabilities	(2,151)	(5,026)
Deferred revenue	8,236	9,037
Total adjustments	32,121	31,807
Net cash provided by operating activities	38,444	34,581
Cash Flows From Investing Activities
Purchases of property and equipment	(8,821)	(6,765)
Net cash used in investing activities	(8,821)	(6,765)
Cash Flows From Financing Activities
Net payments under line of credit	(24,545)	(31,043)
Capital lease proceeds	206	4,356
Borrowing under note payable	3,105	2,859
Payments under notes payable	(920)	(813)
Change in book overdraft	(1,542)	(4,410)
Payments of obligations under capital lease	(2,222)	(1,666)
Proceeds from stock issued under stock option plans	1,895	206
Payment for deferred financing costs	(1,141)
Common shares repurchased and held in treasury	(1,633)	(420)
Excess tax benefit related to stock option exercises	260	141
Net cash used in financing activities	(26,537)	(30,790)
Effect of foreign currency on cash flow	(193)	(45)
Net change in cash and cash equivalents	2,893	(3,019)
Cash and cash equivalents at beginning of the period	6,535	9,484
Cash and cash equivalents at end of the period	9,428	6,465
Supplemental Cash Flow Information
Interest paid	2,454	2,459
Income taxes paid	3,260	1,404
Supplemental Non-Cash Investing and Financing Activities
Purchase of property and equipment	$ 2,378	$ 858