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:
Net earnings	$ 55,972	$ 59,722	$ 52,826
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	46,202	39,964	30,524
Stock compensation expense	7,024	6,829	4,557
Deferred income taxes	(6,881)	(2,857)	(11,259)
Provision for doubtful accounts	258	(53)	238
Foreign currency transaction loss	(16)	25	105
Loss on disposal of assets	320	301	150
Changes in assets and liabilities, net of acquired balances
Accounts receivable	(15,659)	10,809	(8,395)
Inventories	4,745	3,126	6,698
Prepaid expenses and other current assets	240	1,233	(848)
Accounts payable and accrued expenses	17,841	(15,718)	7,747
Income taxes	(2,765)	633	3,370
Other	331	(188)	(363)
Net cash provided by operating activities	107,612	103,826	85,350
Cash flows from investing activities:
Capital expenditures	(23,034)	(41,300)	(13,199)
Cash paid for acquisition, net of cash acquired	(110,601)	0	(491,057)
Proceeds from sale of property, plant and equipment	4	34	1
Proceeds from insurance	1,000	0	0
Intangible assets acquired	(963)	(1,011)	(169)
Net cash used in investing activities	(133,594)	(42,277)	(504,424)
Cash flows from financing activities:
Proceeds from long-term debt	0	0	350,000
Principal payments on long-term debt	(35,000)	(35,000)	(17,500)
Proceeds from revolving loan	72,500	0	50,000
Principal payments on revolving loan	(53,500)	0	(50,000)
Principal payment on acquired debt	(884)	0	(75,550)
Cash paid for financing costs	0	0	(2,593)
Repayments of short-term obligations	0	0	(89)
Proceeds from stock options exercised	7,192	12,605	9,106
Excess tax benefits from stock compensation	2,546	7,009	7,220
Dividends paid	(10,720)	(9,251)	(7,856)
Purchase of treasury stock	(1,588)	(1,205)	(1,068)
Net cash (used in)/provided by financing activities	(19,454)	(25,842)	261,670
Effect of exchange rate changes on cash	(716)	(1,199)	(1,056)
(Decrease)/Increase in cash and cash equivalents	(46,152)	34,508	(158,460)
Cash and cash equivalents beginning of period	84,795	50,287	208,747
Cash and cash equivalents end of period	$ 38,643	$ 84,795	$ 50,287