CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITES
Net earnings	$ 60,670	$ 52,518
Adjustments to reconcile net earnings to cash provided by operating activities:
Depreciation	13,977	12,780
Amortization expense (including deferred financing fees)	2,966	2,927
Stock-based compensation	7,246	5,650
Inventory obsolescence	2,186	1,510
Unrealized foreign currency losses (gains)	1,324	(7,173)
Bad debt and customer credits	4,854	755
Loss on disposal of property, plant and equipment	4	392
Changes in assets and liabilities:
Customer receivables	28,997	19,124
Inventories	(6,807)	(11,713)
Accounts payable	(8,186)	(44,481)
Current and deferred income taxes	958	(5,941)
Other current assets	(1,548)	(1,417)
Other current liabilities	758	7,574
Other noncurrent assets and liabilities	(11,737)	5,634
Cash provided by operating activities	95,662	38,139
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, net	(25,442)	(19,837)
Purchase of a business, net of cash acquired	(8,389)	0
Cash used in investing activities	(33,831)	(19,837)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from credit facility	253,500	230,000
Repayment of credit facility	(280,500)	(230,500)
Payment of dividends	(21,946)	(17,194)
Proceeds from the issuance of common stock	2,847	5,247
Purchase of common stock for treasury	(4,503)	(7,478)
Contingent purchase price payment	(5,000)	(5,000)
Tax benefit from the exercise of stock options and vesting of equity awards	0	940
Cash used in financing activities	(55,602)	(23,985)
Effect of exchange rate changes on cash and cash equivalents	766	(3,581)
Net increase (decrease) in cash and cash equivalents	6,995	(9,264)
Cash and cash equivalents at beginning of period	4,192	19,021
Cash and cash equivalents at end of period	$ 11,187	$ 9,757