CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities
Net income	$ 55,189	$ 64,031
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,059	35,146
Provision for doubtful accounts	395	28
Deferred income taxes	(1,673)	3,865
Excess tax benefits from stock based compensation	(372)	(67)
Lower of cost or market inventory adjustment	2,798
Loss (gain) on disposal or impairment of assets	4,864	(56)
Foreign currency transaction loss, net	82	2
Stock compensation expense	5,887	4,519
Changes in operating assets and liabilities:
Trade accounts and other receivables	11,358	(52,708)
Inventories	(21,020)	10,901
Prepaid expenses and other current assets	(1,746)	(3,772)
Long-term prepaid expenses	157	1,973
Accounts payable	8,501	2,460
Accrued expenses	(1,572)	3,730
Accrued income taxes, net	(3,123)	1,185
Net cash provided by operating activities	96,784	71,237
Investing activities
Capital expenditures	(131,232)	(61,186)
Net cash used in investing activities	(131,232)	(61,186)
Financing activities
Dividends paid	(21,500)	(19,427)
Purchase of common stock	(6,892)	(6,821)
Excess tax benefits from stock based compensation	372	67
Net cash used in financing activities	(28,020)	(26,181)
Effect of exchange rate changes on cash	(1,678)	(748)
Net decrease in cash and cash equivalents	(64,146)	(16,878)
Cash and cash equivalents at beginning of period	94,250	90,635
Cash and cash equivalents at end of period	30,104	73,757
Supplemental cash flow information
Interest paid	20	3
Income taxes paid	$ 30,476	$ 24,909