CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITES
Net earnings	$ 65,948	$ 46,585	$ 23,184
Adjustments to reconcile net earnings to cash provided by operating activities:
Depreciation	17,364	16,327	14,727
Amortization expense (including deferred financing fees)	3,915	3,715	1,634
Provision for deferred taxes	158	(269)	3,529
Write-off of deferred financing fees	0	347	0
Inventory obsolescence	2,656	1,761	2,043
Loss on disposal of property, plant and equipment	1,229	464	128
Unrealized foreign currency gains	(8,789)	(6,640)	(4,578)
Stock-based compensation	8,166	8,062	10,473
Intangible asset impairment charges	10,650	0	8,900
Bad debt and customer credits	1,477	2,590	834
Changes in assets and liabilities, net of effects of acquisitions:
Customer receivables	(4,292)	(13,814)	1,621
Inventories	(4,481)	(23,063)	(1,085)
Accounts payable	(26,253)	23,002	6,204
Current income taxes	675	(5,528)	15,663
Other current assets	(5,425)	(3,601)	414
Other current liabilities	22,937	(6,969)	(8,098)
Other noncurrent assets and liabilities	2,919	45,258	(20,979)
Cash provided by operating activities	88,854	88,227	54,614
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, net	(29,610)	(41,901)	(29,379)
Purchase of business, net of cash acquired	0	(93,349)	0
Cash used in investing activities	(29,610)	(135,250)	(29,379)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from credit facility	309,000	789,000	281,000
Repayment of credit facility	(345,000)	(704,000)	(301,000)
Payment of financing fees	(10)	(1,938)	(13)
Payment of dividends	(24,364)	(22,742)	(22,529)
Proceeds from the issuance of common stock	5,756	4,914	4,029
Purchase of common stock for treasury	(8,725)	(8,974)	(5,638)
Contingent purchase price payment	(5,000)	0	0
Tax benefit from the exercise of stock options and vesting of equity awards	826	1,005	643
Cash (used in) provided by financing activities	(67,517)	57,265	(43,508)
Effect of exchange rate changes on cash and cash equivalents	(6,556)	(3,247)	343
Net (decrease) increase in cash and cash equivalents	(14,829)	6,995	(17,930)
Cash and cash equivalents at beginning of year	19,021	12,026	29,956
Supplemental disclosure of cash flow information:	4,192	19,021	12,026
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	6,168	6,879	5,280
Cash paid for income taxes	$ 40,781	$ 18,646	$ 18,281