Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 195,603	$ 117,676
Marketable securities	27,228	27,165
Trade accounts receivable, net of allowance for doubtful accounts of $6,054 and $5,647, respectively	411,033	338,594
Inventories	675,828	646,152
Deferred income tax assets	13,064	16,718
Other current assets	100,134	89,833
Total current assets	1,422,890	1,236,138
Property and equipment, less accumulated depreciation	483,935	435,601
Other assets, net	12,886	13,209
Total assets	1,919,711	1,684,948
Current liabilities:
Accounts payable	84,882	73,779
Accrued expenses	123,179	111,962
Income taxes payable	7,955	2,077
Total current liabilities	216,016	187,818
Deferred income tax liabilities	39,317	38,154
Stockholders' equity:
Preferred stock, 5,000,000 shares authorized	0	0
Common stock, 400,000,000 shares authorized, 296,307,832 and 295,258,674 shares issued and outstanding, respectively	2,963	2,953
Additional paid-in capital	53,038	16,856
Retained earnings	1,589,381	1,424,371
Accumulated other comprehensive income	18,996	14,796
Total stockholders' equity	1,664,378	1,458,976
Total liabilities and stockholders' equity	$ 1,919,711	$ 1,684,948