Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating activities
Net income	$ 62,208	$ 60,108
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	21,801	16,487
Provision for doubtful accounts	12
Deferred income taxes	5,299	2,905
Excess tax benefits from stock based compensation	(1,257)	(1,270)
(Gain)/loss on disposal or impairment of assets	(54)	1,649
Foreign currency transaction (gain) loss, net	(144)	314
Stock compensation expense	3,087	2,795
Changes in operating assets and liabilities:
Trade accounts and other receivables	(5,525)	(14,291)
Inventories	1,938	(13,293)
Prepaid expenses and other current assets	(1,451)	(2,242)
Long-term prepaid expenses	766	447
Accounts payable	(18,142)	(2,583)
Accrued expenses	(12,482)	2,689
Accrued income taxes, net	5,764	(1,576)
Net cash provided by operating activities	61,820	52,139
Investing activities
Capital expenditures	(50,288)	(37,468)
Net cash used in investing activities	(50,288)	(37,468)
Financing activities
Proceeds from bank borrowings	10,000
Repayments on bank borrowings	(10,000)
Net proceeds from stock based compensation		76
Dividends paid	(11,095)	(9,264)
Purchase of common stock	(7,655)	(814)
Excess tax benefits from stock based compensation	1,257	1,270
Net cash used in financing activities	(17,493)	(8,732)
Effect of exchange rate changes on cash	(443)	655
Net (decrease) increase in cash and cash equivalents	(6,404)	6,594
Cash and cash equivalents at beginning of period	41,270	46,656
Cash and cash equivalents at end of period	34,866	53,250
Supplemental cash flow information
Interest paid	72
Income taxes paid	$ 20,621	$ 30,611