Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net earnings	$ 32,053	$ 26,036
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	22,083	22,666
Stock compensation expense	2,885	3,949
Deferred income taxes	(11)	217
Provision for doubtful accounts	170	123
Foreign currency transaction loss	218	15
Loss on disposal of assets	188	88
Changes in assets and liabilities
Accounts receivable	1,917	1,056
Inventories	(1,990)	3,992
Prepaid expenses and other current assets	(1,732)	1,295
Accounts payable and accrued expenses	(7,575)	3,627
Income taxes	(2,628)	(6,573)
Other	114	(533)
Net cash provided by operating activities	45,692	55,958
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(16,759)	(110,601)
Capital expenditures	(10,819)	(14,736)
Proceeds from insurance	2,000	0
Intangible assets acquired	(330)	(586)
Net cash used in investing activities	(25,908)	(125,923)
Cash flows from financing activities:
Proceeds from revolving loan	22,000	65,000
Principal payments on revolving loan	(9,500)	(20,000)
Principal payments on long-term debt	(17,500)	(17,500)
Principal payment on acquired debt	(2,384)	(884)
Proceeds from stock options exercised	4,893	3,032
Excess tax benefits from stock compensation	0	792
Dividends paid	(12,069)	(10,727)
Purchase of treasury stock	(1,741)	(1,478)
Net cash (used in) provided by financing activities	(16,301)	18,235
Effect of exchange rate changes on cash	1,473	356
Increase (Decrease) in cash and cash equivalents	4,956	(51,374)
Cash and cash equivalents beginning of period	38,643	84,795
Cash and cash equivalents end of period	$ 43,599	$ 33,421