CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating activities
Net income	$ 130,136	$ 78,716	$ 52,810
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	36,015	27,728	24,905
Provision for doubtful accounts	229	40	516
Deferred income taxes	4,223	2,662	573
Excess tax benefits from stock based compensation	(1,399)	(759)	(225)
Loss on disposal or impairment of assets	1,548	1,449	156
Foreign currency transaction loss, net	135	96	192
Stock compensation expense	4,719	3,812	2,571
Changes in operating assets and liabilities:
Trade accounts and other receivables	(23,101)	(29,857)	8,119
Inventories	(41,704)	(10,818)	(14,639)
Prepaid expenses and other current assets	(1,142)	(174)	(606)
Long-term prepaid expenses	(24,083)	(14)	236
Accounts payable	15,971	13,439	(7,971)
Accrued expenses	11,846	8,160	(529)
Accrued income taxes, net	(1,980)	(2,695)	(44,058)
Net cash provided by operating activities	111,413	91,785	22,050
Investing activities
Capital expenditures	(90,395)	(96,566)	(46,127)
Acquisition of BBL Falcon Industries, Ltd.		193	(23,000)
Purchase of short-term investment		(4,989)
Proceeds from maturity of short-term investment		4,989
Net cash used in investing activities	(90,395)	(96,373)	(69,127)
Financing activities
Net proceeds from stock based compensation	76	254	896
Dividends paid	(20,369)	(17,570)	(16,287)
Purchase of common stock	(7,550)	(1,904)	(22,755)
Excess tax benefits from stock based compensation	1,399	759	225
Net cash used in financing activities	(26,444)	(18,461)	(37,921)
Effect of exchange rate changes on cash	40	148	(262)
Net decrease in cash and cash equivalents	(5,386)	(22,901)	(85,260)
Cash and cash equivalents at beginning of year	46,656	69,557	154,817
Cash and cash equivalents at end of year	41,270	46,656	69,557
Supplemental cash flow information
Interest paid	1	2	1
Income taxes paid	$ 65,071	$ 40,667	$ 70,463