Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating activities
Net income	$ 86,106	$ 97,019
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	33,333	25,661
Provision for doubtful accounts	12	240
Deferred income taxes	7,469	6,063
Excess tax benefits from stock based compensation	(1,292)	(1,270)
(Gain) loss on disposal or impairment of assets	(12)	1,537
Foreign currency transaction loss, net	31	228
Stock compensation expense	4,051	3,742
Changes in operating assets and liabilities:
Trade accounts and other receivables	(5,499)	(24,498)
Inventories	2,016	(35,725)
Prepaid expenses and other current assets	(2,679)	(1,868)
Long-term prepaid expenses	1,306	243
Accounts payable	(25,819)	2,568
Accrued expenses	(9,811)	6,898
Accrued income taxes, net	9,302	(3,656)
Net cash provided by operating activities	98,514	77,182
Investing activities
Capital expenditures	(64,124)	(63,148)
Net cash used in investing activities	(64,124)	(63,148)
Financing activities
Proceeds from bank borrowings	10,000
Repayments on bank borrowings	(10,000)
Net proceeds from stock based compensation	54	76
Dividends paid	(17,328)	(14,823)
Purchase of common stock	(7,655)	(7,464)
Excess tax benefits from stock based compensation	1,292	1,270
Net cash used in financing activities	(23,637)	(20,941)
Effect of exchange rate changes on cash	(2)	(72)
Net increase (decrease) in cash and cash equivalents	10,751	(6,979)
Cash and cash equivalents at beginning of period	41,270	46,656
Cash and cash equivalents at end of period	52,021	39,677
Supplemental cash flow information
Interest paid	76	1
Income taxes paid	$ 25,870	$ 48,836