Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 92,190	$ 79,611
Marketable securities	441	354
Trade accounts receivable, net of allowance for doubtful accounts of $8,403 and $6,728, respectively	453,652	372,159
Inventories	755,985	715,383
Deferred income tax assets	13,815	14,420
Other current assets	120,747	97,361
Prepaid income taxes	0	7,368
Total current assets	1,436,830	1,286,656
Property and equipment, less accumulated depreciation	611,051	516,427
Other assets, net	12,538	12,749
Total assets	2,060,419	1,815,832
Current liabilities:
Accounts payable	105,131	78,019
Accrued expenses	152,447	126,155
Income taxes payable	1,994	0
Total current liabilities	259,572	204,174
Deferred income tax liabilities	51,212	51,298
Stockholders' equity:
Preferred stock, 5,000,000 shares authorized	0	0
Common stock, 400,000,000 shares authorized, 296,742,069 and 296,564,382 shares issued and outstanding, respectively	2,968	2,966
Additional paid-in capital	68,125	61,436
Retained earnings	1,663,789	1,477,601
Accumulated other comprehensive income	14,753	18,357
Total stockholders' equity	1,749,635	1,560,360
Total liabilities and stockholders' equity	$ 2,060,419	$ 1,815,832