Consolidated Statements of Cash Flows(USD ($)) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net Income	$ 30,891	$ 67,169	$ 51,643
Depreciation	26,362	27,538	29,093
Tax liabilities, noncash changes	(26,275)	0	0
Total deferred taxes	13,626	(38,704)	8,627
Loss on sale of unconsolidated affiliate	0	0	4,110
Equity in losses of unconsolidated affiliates	0	0	2,847
Impairments of long-lived assets and other charges	0	1,337	1,153
Stock-based compensation	2,072	2,251	2,373
Other non-cash items	(256)	595	55
Accounts receivable	21,428	(11,016)	(22,136)
Inventories	(8,345)	4,609	(25,832)
Other assets	(8,126)	8,031	(23,961)
Accounts payable	2,684	(719)	5,488
Income taxes	3,786	(3,553)	7,713
Other liabilities	8,784	6,654	4,448
Non-current tax liabilities	(870)	3,468	(15,043)
NET CASH PROVIDED BY OPERATING ACTIVITIES	65,761	67,660	30,578
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property, plant and equipment	(23,145)	(16,961)	(9,313)
Proceeds from sales and maturities of investments	5,133	21,720	36,149
Purchase of investments	(3,977)	(4,924)	(22,094)
Purchase of equity investment	0	0	(4,500)
Proceeds from sale of unconsolidated affiliate	0	2,867	4,945
Proceeds from sales of fixed assets	1,981	1,659	406
Other	1,476	(680)	(447)
NET CASH PROVIDED BY INVESTING ACTIVITIES	(18,532)	3,681	5,146
CASH FLOWS FROM FINANCING ACTIVITIES:
Cash dividends paid	(34,878)	(17,358)	(17,108)
Proceeds from exercise of stock options	1,530	4,546	2,448
Excess tax benefits from exercise of stock options	4	303	0
NET CASH USED IN FINANCING ACTIVITIES	(33,344)	(12,509)	(14,660)
Effect of exchange rate changes on cash	1,684	(668)	0
Net increase (decrease) in cash and cash equivalents	15,569	58,164	21,064
Cash and cash equivalents at the beginning of the period (Note 2)	187,795	129,631	108,567
Cash and cash equivalents at the end of period (Note 2)	$ 203,364	$ 187,795	$ 129,631