CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
OPERATING ACTIVITIES
Net income	$ 9,680	$ 11,774	$ 19,799	$ 33,644
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	12,953	13,737	39,850	42,120
Amortization	1,790	1,999	5,431	5,621
Change in long-term liabilities, deferred taxes and other credits	7,134	(2,637)	937	95
Provision for write-off of property, plant and equipment	(156)	$ 557	259	1,286
Fair value adjustment on available-for-sale assets	$ 3,225		3,225
Gain on disposition or involuntary conversion of assets			(1,056)	(961)
Excess tax benefit of options exercised		$ (16)	(603)	(161)
Compensation and benefits paid or payable in Class A Common Stock	$ 290	213	1,285	1,160
Changes in operating assets and liabilities that provide/(use) cash:
Accounts receivable	5,100	(4,368)	(4,387)	9,929
Inventories	(3,626)	(1,279)	(10,757)	(12,238)
Prepaid expenses and other current assets	133	661	(857)	275
Income taxes prepaid and receivable	(518)	100	(592)	114
Accounts payable	(3,126)	(2,128)	(4,467)	(2,867)
Accrued liabilities	3,381	4,414	861	(8,265)
Income taxes payable	3,910	1,819	3,987	760
Other, net	1,723	(2,383)	6,330	(6,512)
Net cash provided by operating activities	41,893	22,463	59,245	64,000
INVESTING ACTIVITIES
Purchases of property, plant and equipment	(9,023)	(18,704)	(39,689)	(46,106)
Purchased software	$ (252)	$ (189)	(589)	(504)
Proceeds from sale or involuntary conversion of assets			2,797	961
Net cash used in investing activities	$ (9,275)	$ (18,893)	(37,481)	(45,649)
FINANCING ACTIVITIES
Proceeds from borrowings	5,198	5,420	44,818	10,090
Principal payments on debt	(37,354)	$ (6,815)	(47,100)	$ (30,924)
Debt acquisition costs	(41)		(1,671)
Proceeds from options exercised	$ 75	$ 223	1,799	$ 610
Excess tax benefit of options exercised		16	603	161
Dividends paid	$ (5,441)	(5,094)	(15,646)	(14,633)
Net cash used in financing activities	(37,563)	(6,250)	(17,197)	(34,696)
Effect of exchange rate changes on cash and cash equivalents	(5,749)	(8,695)	(12,589)	(10,860)
Decrease in cash and cash equivalents	(10,694)	(11,375)	(8,022)	(27,205)
Cash and cash equivalents at beginning of period	182,474	206,836	179,802	222,666
Cash and cash equivalents at end of period	$ 171,780	$ 195,461	$ 171,780	$ 195,461