Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows From Operating Activities
Net income	$ 22,773	$ 2,595	$ 17,660
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	13,440	14,181	15,784
Equity income from unconsolidated affiliate	(770)	(528)
Distribution from equity method investee	294	237
Write-off of software work in process			37
Provision for deferred income taxes	(959)	283	1,291
Non-cash stock-based compensation	3,059	2,605	1,961
Change in operating assets and liabilities:
Accounts receivable	(23,829)	(67,997)	(18,274)
Inventories	41,854	(31,252)	(24,831)
Prepaid expenses and other current assets	798	7,061	1,770
Other assets	(7,937)	(333)	1,020
Accounts payable	66,641	8,355	87,719
Accrued expenses and other current liabilities	18,253	3,868	12,948
Deferred revenue	53	(3,853)	(572)
Total adjustments	110,897	(67,373)	78,853
Net cash provided by (used in) operating activities	133,670	(64,778)	96,513
Cash Flows From Investing Activities
Purchases of property and equipment	(5,741)	(17,325)	(8,705)
Acquisitions, net of cash acquired	(35)	(4,806)	(2,077)
Net cash used in investing activities	(5,776)	(22,131)	(10,782)
Cash Flows From Financing Activities
Net (payments) borrowings under line of credit	(125,379)	106,382	(55,043)
Borrowings under notes payable		5,216	526
Payments under notes payable	(3,450)	(3,771)	(5,173)
Change in book overdraft	1,314	3,195	(13,131)
Payments of obligations under capital leases	(1,009)	(1,311)	(2,425)
Payments of earn-out liability	(2,199)	(13,427)	(13,058)
Proceeds from capital lease obligations Capital lease proceeds		587
Net proceeds from stock issued under stock option plans	1,646	5,080	2,541
Payments for deferred financing costs	(275)	(1,009)	(653)
Common shares repurchased and held in treasury		(11,602)	(3,608)
Payment of taxes related to net-settled stock awards	(646)	(894)
Net cash (used in) provided by financing activities	(129,998)	88,446	(90,024)
Effect of foreign currency on cash flow	(977)	404	289
Net change in cash and cash equivalents	(3,081)	1,941	(4,004)
Cash and cash equivalents at beginning of the period	9,113	7,172	11,176
Cash and cash equivalents at end of the period	6,032	9,113	7,172
Supplemental Cash Flow Information
Interest paid	9,051	7,071	5,373
Income taxes paid, net	2,048	4,340	7,332
Supplemental Non-Cash Investing and Financing Activities
Financed purchases of property and equipment	2,508	900	777
Accrued earn-out liability related to acquisitions		$ 707	$ 326