Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Cash flows from operating activities:
Net income	$ 14,664	$ 30,498	$ 32,192
Adjustments to reconcile net income to net cash provided by operating acitivites:
Depreciation	20,479	18,704	19,792
Amortization	34,830	25,175	25,942
Stock-based compensation	8,375	7,499	9,330
Deferred income taxes	(2,871)	2,251	(284)
Gain on sale of facility	(1,890)	0	0
Income tax benefit of stock option exercises	203	3,961	644
Excess tax benefit from stock option exercises	(483)	(4,081)	(922)
Loss on early extinguishment of debt	254	0	0
Increase (decrease) in cash flows from changes in assets and liabilities, net of acquired assets
Accounts receivable	(6,380)	(9,643)	5,255
Inventories	3,103	(18,581)	(10,449)
Accounts payable	2,094	11,508	(3,449)
Income taxes	(200)	(1,357)	5,291
Accrued compensation and benefits	(2,598)	(3,964)	3,572
Other assets	(23,234)	(12,005)	(11,037)
Other liabilities	(8,124)	(1,897)	(10,701)
Total operating	23,558	17,570	32,984
Net cash provided by operating activities	38,222	48,068	65,176
Cash flows from investing activities:
Payments related to business acquisitions and asset acquisitions, net of cash acquired	(256,450)	(9,353)	(5,265)
Proceeds from sale of a facility	5,178	0	0
Purchases of property, plant and equipment	(14,753)	(15,009)	(15,411)
Net cash used in investing activities	(266,025)	(24,362)	(20,676)
Cash flows from financing activities:
Repurchase of common stock	0	0	(16,862)
Excess tax benefit from stock option exercises	483	4,081	922
Payments on term loan	(8,750)	0	0
Proceeds from term loan	175,000	0	0
Payments on revolving line of credit	(162,347)	(112,000)	(86,000)
Proceeds from revolving line of credit	225,000	142,680	113,000
Payments related to distribution agreement	(16,667)	(16,667)	(16,667)
Payments on mortgage notes	(1,339)	(1,234)	(1,140)
Payments related to debt issuance costs	(5,556)	(1,485)	0
Dividends paid on common stock	(22,213)	(22,105)	(21,959)
Other, net	591	(3,043)	2,316
Net cash provided by (used in) financing activities	184,202	(9,773)	(26,390)
Effect of exchange rate changes on cash and cash equivalents	(1,475)	(7,761)	(6,221)
Net increase (decrease) in cash and cash equivalents	(45,076)	6,172	11,889
Cash and cash equivalents at beginning of year	72,504	66,332	54,443
Cash and cash equivalents at end of year	27,428	72,504	66,332
Non-cash investing and financing activities:
Contractual obligations for acquisition of a business	0	440	10,137
Dividends payable	5,566	5,542	5,510
Cash paid during the year for:
Interest	13,758	5,434	5,532
Income taxes	$ 9,588	$ 10,261	$ 10,206