Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities:
Net income	$ 13,472	$ 22,207
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,499	13,063
Amortization of convertible debt discount	582	537
Gain on disposition of property, plant and equipment	(54)	(97)
Stock compensation expense	12,657	2,100
Withholding taxes paid on stock issuances	(720)	(683)
Loss on the sale of businesses	0	767
Changes in assets and liabilities:
Accounts receivable	(16,347)	(1,512)
Inventories	(968)	1,091
Prepaid expenses and other current assets	(235)	(2,272)
Accounts payable	7,144	(672)
Accrued liabilities	(16,679)	(29,379)
Deferred income taxes	485	3,852
Long-term retirement benefits	801	(2,708)
Other	1,020	25
Net cash provided by operating activities	17,657	6,319
Investing activities:
Proceeds from disposition of property, plant and equipment	44	135
Payments related to the sale of businesses, net	0	(363)
Capital expenditures	(10,050)	(7,281)
Other	(1,420)	(1,418)
Net cash used by investing activities	(11,426)	(8,927)
Financing activities:
Net change in other borrowings	8,737	(6,688)
Payments on long-term debt	(6,245)	(13,135)
Proceeds from the issuance of long-term debt	21,000	49,000
Proceeds from the issuance of common stock	2,677	3,324
Common stock repurchases	(12,856)	(11,141)
Dividends paid	(5,443)	(5,459)
Excess tax benefit on stock awards	506	1,227
Other	(53)	(65)
Net cash provided by financing activities	8,323	17,063
Effect of exchange rate changes on cash flows	(1,038)	529
Increase in cash and cash equivalents	13,516	14,984
Cash and cash equivalents at beginning of period	86,356	62,505
Cash and cash equivalents at end of period	$ 99,872	$ 77,489