CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITES
Net earnings	$ 38,573	$ 34,657
Adjustments to reconcile net earnings to cash provided by operating activities:
Depreciation	9,248	8,776
Amortization expense (including deferred financing fees)	1,977	1,951
Stock-based compensation	4,592	3,574
Inventory obsolescence	1,423	864
Unrealized foreign currency losses (gains)	1,605	(6,818)
Bad debt and customer credits	1,282	384
Loss on disposal of property, plant and equipment	1	227
Changes in assets and liabilities:
Customer receivables	16,216	8,864
Inventories	(6,410)	(5,945)
Accounts payable	(10,109)	(36,399)
Current and deferred income taxes	527	(11,437)
Other current assets	(2,675)	(1,765)
Other current liabilities	(9,787)	3,192
Other noncurrent assets and liabilities	(786)	7,317
Cash provided by operating activities	45,677	7,442
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, net	(15,057)	(12,670)
Cash used in investing activities	(15,057)	(12,670)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from credit facility	173,500	170,000
Repayment of credit facility	(185,500)	(154,000)
Payment of dividends	(14,727)	(11,502)
Proceeds from the issuance of common stock	2,120	4,421
Purchase of common stock for treasury	(3,903)	(6,067)
Contingent purchase price payment	(5,000)	(5,000)
Tax benefit from the exercise of stock options and vesting of equity awards	662	979
Cash used in financing activities	(32,848)	(1,169)
Effect of exchange rate changes on cash and cash equivalents	1,584	(2,282)
Net decrease in cash and cash equivalents	(644)	(8,679)
Cash and cash equivalents at beginning of period	4,192	19,021
Cash and cash equivalents at end of period	$ 3,548	$ 10,342