CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Consolidated net income (loss)	$ 22,003	$ 35,615	$ (24,242)
Less: Loss from discontinued operations, net of tax		13	7,333
Income (loss) from continuing operations	22,003	35,628	(16,909)
Adjustments to reconcile income (loss) from continuing operations to net cash provided by operating activities of continuing operations:
Depreciation and amortization	20,357	19,114	23,797
Provision for inventory excess and obsolescence	3,091	1,934	832
Impairment of goodwill and intangible assets			41,442
Share-based compensation	4,293	4,387	4,329
Deferred income taxes	(1,766)	(1,692)	(6,736)
Earnings from equity-method investment	(2,191)	(2,657)	(2,700)
Dividend from equity-method investment	2,341
Gain on disposal of business		(19,629)
Gain on sale of fixed assets	(1,707)	1	19
Contingent consideration adjustments	1,267	430
Non-cash interest expense	882	935	1,379
Other non-cash items	986	1,407	1,567
Changes in assets and liabilities which provided (used) cash, excluding effects from businesses purchased or classified as held for sale:
Accounts receivable	(6,394)	(7,526)	3,526
Inventories	(2,917)	(3,338)	(991)
Prepaid expenses and other current assets	(1,729)	902	(527)
Prepaid income taxes and income taxes receivable	462	3,431	(206)
Accounts payable, income taxes payable, accrued expenses and other current liabilities	10,590	2,167	(4,698)
Other non-current assets and liabilities	(1,780)	(2,065)	(134)
Cash provided by operating activities of continuing operations	47,788	33,429	43,990
Cash used in operating activities of discontinued operations		(13)	(1,701)
Cash provided by operating activities	47,788	33,416	42,289
Cash flows from investing activities:
Purchases of property, plant and equipment	(8,462)	(5,552)	(5,415)
Acquisition of businesses, net of cash acquired and escrow recovery	(8,958)	(25,987)	(88,238)
Acquisition of intangible assets	(3,980)
Proceeds from the sale of business, net of transaction costs		29,570
Proceeds from the sale of property, plant and equipment	7,037	127	112
Cash used in investing activities of continuing operations	(14,363)	(1,842)	(93,541)
Cash provided by investing activities of discontinued operations	1,498	209	3,768
Cash used in investing activities	(12,865)	(1,633)	(89,773)
Cash flows from financing activities:
Borrowings under revolving credit facility		13,000	77,000
Repayments of long-term debt and revolving credit facility	(16,250)	(30,500)	(33,500)
Payments for debt issuance costs	(2,523)		(712)
Payments of withholding taxes from stock-based awards	(1,789)	(1,941)	(1,666)
Repurchase of common stock	(1,634)	(1,627)
Proceeds from the exercise of stock option	181
Other financing activities	(1,174)	(467)	(841)
Cash provided by (used in) financing activities of continuing operations	(23,189)	(21,535)	40,281
Cash provided by (used in) financing activities of discontinued operations	0	0	0
Cash provided by (used in) financing activities	(23,189)	(21,535)	40,281
Effect of exchange rates on cash and cash equivalents	(3,585)	(1,435)	(2,631)
Increase (decrease) in cash and cash equivalents	8,149	8,813	(9,834)
Cash and cash equivalents, beginning of year	59,959	51,146	60,980
Cash and cash equivalents, end of year	68,108	59,959	51,146
Supplemental disclosure of cash flow information:
Cash paid for interest	2,917	3,784	3,793
Cash paid for income taxes	14,058	10,688	6,087
Income tax refunds received	932	3,939	931
Supplemental disclosure of non-cash investing activity:
Accrual for capital expenditures	1,253	1,180	26
Supplemental disclosure of non-cash financing activity:
Assets acquired under capital lease obligation	$ 0	$ 0	$ 10,438