CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Consolidated net income	$ 62,307	$ 22,003	$ 35,615
Less: Loss from discontinued operations, net of tax			13
Income from continuing operations	62,307	22,003	35,628
Adjustments to reconcile income from continuing operations to net cash provided by operating activities of continuing operations:
Depreciation and amortization	30,758	20,357	19,114
Provision for inventory excess and obsolescence	1,421	3,091	1,934
Share-based compensation	5,493	4,293	4,387
Deferred income taxes	(2,560)	(1,766)	(1,692)
Earnings from equity-method investment	(104)	(2,191)	(2,657)
Dividend from equity-method investment		2,341
Gain on acquisition of business	(26,409)
Gain on disposal of business			(19,629)
Gain on sale of fixed assets	36	(1,707)	1
Contingent consideration adjustments	425	1,267	430
Inventory acquisition fair value adjustment	4,754	173	215
Non-cash interest expense	825	882	935
Other non-cash items	283	813	1,192
Changes in assets and liabilities which provided (used) cash, excluding effects from businesses purchased or classified as held for sale:
Accounts receivable	(2,077)	(6,394)	(7,526)
Inventories	(13,587)	(2,917)	(3,338)
Prepaid expenses and other current assets	(2,169)	(1,729)	902
Prepaid income taxes and income taxes receivable	(2,282)	462	3,431
Accounts payable, income taxes payable, accrued expenses and other current liabilities	8,993	10,590	2,167
Other non-current assets and liabilities	(2,729)	(1,780)	(2,065)
Cash provided by operating activities of continuing operations	63,378	47,788	33,429
Cash used in operating activities of discontinued operations			(13)
Cash provided by operating activities	63,378	47,788	33,416
Cash flows from investing activities:
Purchases of property, plant and equipment	(9,094)	(8,462)	(5,552)
Acquisition of businesses, net of cash acquired	(168,332)	(8,958)	(25,987)
Acquisition of intangible assets		(3,980)
Proceeds from sale of business, net of transaction costs			29,570
Proceeds from sale of property, plant and equipment	46	7,037	127
Cash used in investing activities of continuing operations	(177,380)	(14,363)	(1,842)
Cash provided by investing activities of discontinued operations		1,498	209
Cash used in investing activities	(177,380)	(12,865)	(1,633)
Cash flows from financing activities:
Borrowings under revolving credit facility	176,769		13,000
Repayments of long-term debt and revolving credit facility	(26,925)	(16,250)	(30,500)
Payments of debt issuance costs	(655)	(2,523)
Payments of withholding taxes from stock-based awards	(2,090)	(1,789)	(1,941)
Payments of contingent considerations	(2,546)
Repurchases of common stock	(370)	(1,634)	(1,627)
Other financing activities	(853)	(993)	(467)
Cash provided by (used in) financing activities of continuing operations	143,330	(23,189)	(21,535)
Cash provided by (used in) financing activities of discontinued operations	0	0	0
Cash provided by (used in) financing activities	143,330	(23,189)	(21,535)
Effect of exchange rates on cash and cash equivalents	2,621	(3,585)	(1,435)
Increase in cash and cash equivalents	31,949	8,149	8,813
Cash and cash equivalents, beginning of year	68,108	59,959	51,146
Cash and cash equivalents, end of year	100,057	68,108	59,959
Supplemental disclosure of cash flow information:
Cash paid for interest	5,832	2,917	3,784
Cash paid for income taxes	21,121	14,058	10,688
Income tax refunds received	337	932	3,939
Supplemental disclosure of non-cash investing activity:
Accrual for capital expenditures	$ 1,601	$ 1,253	$ 1,180