Consolidated Statements of Cash Flows (Unaudited) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Flows From Operating Activities
Net income (loss)	$ 29,962,000	$ 24,505,000	$ (42,834,000)
Items not affecting use of cash
Depreciation	29,667,000	31,245,000	30,628,000
Impairment charges and asset write-offs	0	1,249,000	72,014,000
Amortization of other intangible assets	3,340,000	2,969,000	2,922,000
Non-cash stock compensation	2,708,000	2,595,000	2,326,000
(Recovery of ) provision for loss on accounts receivable	(543,000)	915,000	(1,455,000)
Deferred taxes	1,052,000	(184,000)	(13,285,000)
Other long-term liabilities	4,057,000	4,251,000	151,000
Gain on sale of property, plant and equipment	(1,085,000)	(875,000)	(733,000)
Other	50,000	50,000	0
Payments on performance based compensation	(333,000)	0	0
Cash flow (used for) provided by working capital, net of acquisitions:
Accounts receivable	(2,002,000)	(8,665,000)	(9,994,000)
Inventories	(2,780,000)	455,000	4,958,000
Prepaid expenses	(2,119,000)	2,662,000	548,000
Accounts payable and accrued expenses	(1,222,000)	3,000,000	392,000
Net cash provided by operating activities	60,752,000	64,172,000	45,638,000
Cash Flows From Investing Activities
Additions to property, plant and equipment	(26,977,000)	(21,930,000)	(20,533,000)
Acquisition of business, net of cash acquired	(18,543,000)	(1,100,000)	(411,000)
Proceeds from sale of property, plant and equipment	3,086,000	1,089,000	5,213,000
Other	(50,000)	(96,000)	358,000
Net cash used for investing activities	(42,484,000)	(22,037,000)	(15,373,000)
Cash Flows From Financing Activities
Repayment of long-term debt	(27,258,000)	(305,000)	(65,380,000)
Net borrowing (repayment) of credit facility	17,700,000	(9,383,000)	44,900,000
Cash dividends paid	(13,006,000)	(9,523,000)	(9,209,000)
Proceeds from issuance of common stock	3,122,000	751,000	138,000
Tax benefit from options exercised	(253,000)	0	0
Repurchase of common stock	(4,204,000)	(20,946,000)	0
Deferred financing costs	0	0	(1,169,000)
Net cash used for financing activities	(23,899,000)	(39,406,000)	(30,720,000)
Foreign Exchange Rate Effect on Cash	2,778,000	(633,000)	432,000
Net (decrease) increase in cash	(2,853,000)	2,096,000	(23,000)
Cash at January 1	6,801,000	4,705,000	4,728,000
Cash at December 31	3,948,000	6,801,000	4,705,000
Supplemental Disclosures of Cash Flow Information
Interest	4,008,000	4,129,000	6,920,000
Income taxes	$ 21,375,000	$ 11,168,000	$ 9,468,000