Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating activities:
Net income	$ 95,249	$ 64,715	$ 53,278
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	57,360	58,904	52,770
Amortization of convertible debt discount	2,211	2,158	5,727
(Gain) loss on disposition of property, plant and equipment	(178)	(379)	266
Stock compensation expense	8,819	8,319	7,655
Withholding taxes paid on stock issuances	(1,150)	(1,124)	(440)
Loss on the sale of businesses	799	26,128	0
Changes in assets and liabilities, net of the effects of acquisitions/divestitures:
Accounts receivable	(4,160)	(24,707)	(35,891)
Inventories	5,404	(12,384)	(24,006)
Prepaid expenses and other current assets	(4,341)	59	(3,139)
Accounts payable	(5,493)	615	12,466
Accrued liabilities	(9,659)	11,226	11,456
Deferred income taxes	9,446	5,386	(1,566)
Long-term retirement benefits	(16,438)	(18,367)	(12,135)
Other	(1,492)	475	(681)
Net cash provided by operating activities	136,377	121,024	65,760
Investing activities:
Proceeds from disposition of property, plant and equipment	854	3,620	1,498
(Payments for) proceeds from the sale of businesses, net of cash sold	(438)	22,492	0
Change (investment) in restricted cash	4,900	(11,664)	0
Capital expenditures	(37,787)	(37,082)	(28,759)
Business acquisitions, net of cash acquired	(296,560)	(3,495)	0
Other	(3,776)	(4,483)	(3,038)
Net cash used by investing activities	(332,807)	(30,612)	(30,299)
Financing activities:
Net change in other borrowings	(8,852)	7,168	347
Payments on long-term debt	(114,411)	(411,661)	(359,542)
Proceeds from the issuance of long-term debt	376,000	392,390	359,917
Premium paid on convertible debt redemption	0	(9,803)	0
Proceeds from the issuance of common stock	7,061	28,579	5,746
Common stock repurchases	(19,037)	(34,066)	(28,100)
Dividends paid	(21,662)	(18,629)	(17,461)
Excess tax benefit on stock awards	1,438	8,056	0
Other	(1,261)	(2,229)	(207)
Net cash provided (used) by financing activities	219,276	(40,195)	(39,300)
Effect of exchange rate changes on cash flows	1,005	(1,162)	(138)
Increase (decrease) in cash and cash equivalents	23,851	49,055	(3,977)
Cash and cash equivalents at beginning of year	62,505	13,450	17,427
Cash and cash equivalents at end of year	86,356	62,505	13,450
Supplemental Disclosure of Cash Flow Information:
Debt assumed in connection with acquisition	$ 45,537