CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net earnings	$ 10,894	$ 12,401
Adjustments to reconcile net earnings to cash provided by operating activities:
Depreciation and amortization	10,294	5,667
Provision for losses on receivables	20	77
LIFO expense	1,000	1,000
Deferred income tax benefit	(575)	(312)
Excess tax benefit from share-based compensation	(731)	(2,270)
Share-based compensation expense	1,619	871
Pension expense	4,090	2,170
Postretirement obligation	71	186
(Gain) loss on disposition of property, plant and equipment	(167)	41
Changes in:
Receivables, net	(4,384)	(4,708)
Income tax receivable	70	103
Inventories	(20,718)	(15,270)
Other current assets	(8,328)	(1,581)
Accounts payable	23,451	18,269
Accrued liabilities	(1,452)	4,421
Net cash provided by operating activities	15,154	21,065
Cash flows from investing activites:
Additions to property, plant and equipment	(24,433)	(26,196)
Proceeds from disposition of property, plant and equipment	182	59
Decrease in other assets	(736)	(190)
Acquisition of other companies	(147,333)	(1,500)
Net cash used in investing activities	(172,320)	(27,827)
Cash flows from financing activites:
Proceeds from long-term debt	0
Payments of notes payable	(35,157)	0
Dividends paid	(3,831)	(3,803)
Excess tax benefit from share-based compensation	731	2,270
Proceeds from exercise of stock options	1,533	3,977
Proceeds from equity offering	217,565
Net cash provided by financing activities	180,841	2,444
Effect of translation on cash and cash equivalents	592	484
Net decrease in cash and cash equivalents	24,267	(3,834)
Cash and cash equivalents at beginning of period	38,438	88,592
Cash and cash equivalents at end of period	$ 62,705	$ 84,758