Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities
Net income	$ 16,195	$ 15,643
Items not affecting use of cash:
Depreciation	16,146	14,737
Amortization of intangible assets	2,046	1,514
Non-cash stock compensation	1,532	1,556
Provision for (recovery of) loss on accounts receivable	496	(1,178)
Deferred taxes	2,140	(18)
Other long-term liabilities	334	785
Loss (gain) from asset disposition	616	(558)
Other	11	50
Cash flows provided by (used for) working capital, net of acquisitions:
Accounts receivable	5,216	10,384
Inventories	(735)	(12,285)
Prepaid expenses	(1,048)	(3,743)
Accounts payable and accrued expenses	(12,812)	(18,967)
Net cash provided by operating activities	30,137	7,920
Cash Flows from Investing Activities
Capital expenditures	(10,216)	(8,386)
Acquisition of business, net of cash acquired	(600)	0
Proceeds from sale of property, plant and equipment	0	1,805
Other	(11)	(149)
Net cash used for investing activities	(10,827)	(6,730)
Cash Flows from Financing Activities
Repayment of long-term debt	0	(305)
Net borrowing on credit facility	3,173	28,374
Cash dividends paid	(3,019)	(4,967)
Proceeds from issuance of common stock	3,262	2,822
Tax benefit from options	50	0
Repurchase of common stock	(3,982)	0
Net cash (used for) provided by financing activities	(516)	25,924
Foreign exchange rate effect on cash	(484)	1,697
Net increase in cash	18,310	28,811
Cash at January 1	3,948	6,801
Cash at June 30	$ 22,258	$ 35,612