CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net earnings	$ 19,118	$ 10,894
Adjustments to reconcile net earnings to cash provided by operating activities:
Depreciation and amortization	11,598	10,294
Provision for losses on receivables	1,138	20
LIFO expense	900	1,000
Deferred income tax benefit	(849)	(575)
Excess tax benefit from share-based compensation	(167)	(731)
Share-based compensation expense	2,573	1,619
Pension expense	4,806	4,090
Postretirement obligation	(34)	71
(Gain) on disposition of property, plant and equipment	(787)	(167)
Changes in:
Receivables, net	(579)	(4,384)
Income tax receivable	13	70
Inventories	(25,042)	(20,718)
Other current assets	(2,607)	(8,328)
Accounts payable	(4,423)	23,451
Accrued liabilities	193	(1,452)
Net cash provided by operating activities	5,851	15,154
Cash flows from investing activities:
Additions to property, plant and equipment (net of incentives)	(5,859)	(24,433)
Proceeds from disposition of property, plant and equipment	1,093	182
Increase (decrease) in other assets	86	(736)
Acquisition of other companies	0	(147,333)
Net cash used in investing activities	(4,680)	(172,320)
Cash flows from financing activities:
Payments of notes payable	(6,562)	(35,157)
Dividends paid	(4,199)	(3,831)
Excess tax benefit from share-based compensation	167	731
Proceeds from exercise of stock options	1,105	1,533
Proceeds from equity offering	0	217,565
Net cash (used in) provided by financing activities	(9,489)	180,841
Effect of translation on cash and cash equivalents	(844)	592
Net (decrease) increase in cash and cash equivalents	(9,162)	24,267
Cash and cash equivalents at beginning of period	72,308	38,438
Cash and cash equivalents at end of period	$ 63,146	$ 62,705