CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings	$ 15,396	$ 17,411
Adjustments to reconcile net earnings to cash provided by operating activities:
Depreciation	5,089	4,560
Amortization expense (including deferred financing fees)	989	989
Inventory obsolescence	744	647
Loss on disposal of property, plant and equipment	25	7
Unrealized foreign currency (gains) losses	(12)	1,262
Stock-based compensation	3,344	2,138
Bad debt and customer credits	(509)	91
Changes in assets and liabilities:
Customer receivables	1,876	8,570
Inventories	(4,765)	(7,348)
Prepaid and other current assets	1,456	7,749
Accounts payable	(5,105)	1,299
Current and deferred income taxes	2,447	578
Other current liabilities	(13,895)	(16,393)
Other noncurrent assets and liabilities	(3,255)	(304)
Cash provided by operating activities	3,825	21,256
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, net	(10,650)	(7,017)
Cash used in investing activities	(10,650)	(7,017)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from credit facility	130,000	99,500
Repayment of credit facility	(106,000)	(99,500)
Payment of dividends	(8,427)	(7,196)
Proceeds from the issuance of common stock	526	399
Purchase of common stock for treasury	(10,348)	(1,902)
Contingent purchase price payment	(6,000)	(5,000)
Cash used in financing activities	(249)	(13,699)
Effect of exchange rate changes on cash and cash equivalents	255	616
Net (decrease) increase in cash and cash equivalents	(6,819)	1,156
Cash and cash equivalents at beginning of period	9,854	4,192
Cash and cash equivalents at end of period	$ 3,035	$ 5,348