CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net earnings	$ 81,857	$ 65,971	$ 43,823
Adjustments to reconcile net earnings to cash provided by operating activities:
Depreciation and amortization	43,283	24,266	21,158
Loss (recovery) on receivables	94	(57)	(86)
LIFO expense (income)	2,851	3,327	(1,185)
Litigation expense	3,377	1,780	0
Deferred income tax (benefit)/provision	(3,280)	9,566	1,436
Excess tax benefit from share-based compensation	(859)	(2,701)	(2,344)
Share-based compensation expense	7,386	5,310	4,627
Pension expense	3,558	9,813	7,861
Postretirement (income) expense	(79)	156	422
(Gain) loss on disposition of property, plant and equipment	(312)	1,614	(451)
Earnings from discontinued operations	0	0	(292)
Changes in:
Receivables, net	(23,240)	(59,574)	(34,965)
Income tax receivable	(713)	(2,466)	(2,359)
Inventories	(50,272)	(27,021)	(4,986)
Other current assets	(1,232)	(639)	(357)
Accounts payable	11,243	13,641	6,550
Accrued liabilities	3,918	3,671	20,646
Net cash provided by operating activities	77,580	46,657	59,498
Cash flows from investing activites:
Additions to property, plant and equipment (net of incentives)	(78,119)	(103,559)	(60,363)
Proceeds from disposition of property, plant and equipment	2,293	970	1,021
Decrease (increase) in other assets	937	552	(265)
Acquisition of other companies and assets	(150,127)	(331,484)	(9,857)
Net cash used in investing activities	(225,016)	(433,521)	(69,464)
Cash flows from financing activites:
Issuance of long-term debt	25,000	350,000
Debt issuance cost	0	(5,247)
Payments of notes payable	(48,296)	0	(2,888)
Dividends paid	(16,422)	(15,230)	(15,017)
Excess tax benefit from share-based compensation	859	2,701	2,344
Proceeds from exercise of stock options	1,950	5,162	13,277
Proceeds from equity offering	217,565	0	0
Net cash provided by (used in) financing activities	180,656	337,386	(2,284)
Effect of translation on cash and cash equivalents	650	(676)	(15)
Net increase (decrease) in cash and cash equivalents	33,870	(50,154)	(12,266)
Cash and cash equivalents at beginning of period	38,438	88,592	100,858
Cash and cash equivalents at end of period	$ 72,308	$ 38,438	$ 88,592