Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 185,916	$ 117,676
Marketable securities	27,166	27,165
Trade accounts receivable, net of allowance for doubtful accounts of $5,934 and $5,647, respectively	399,993	338,594
Inventories	662,689	646,152
Deferred income tax assets	13,741	16,718
Other current assets	88,591	89,833
Total current assets	1,378,096	1,236,138
Property and equipment, less accumulated depreciation	459,652	435,601
Other assets, net	12,999	13,209
Total assets	1,850,747	1,684,948
Current liabilities:
Accounts payable	81,243	73,779
Accrued expenses	119,279	111,962
Income taxes payable	9,997	2,077
Total current liabilities	210,519	187,818
Deferred income tax liabilities	39,331	38,154
Stockholders' equity:
Preferred stock, 5,000,000 shares authorized	0	0
Common stock, 400,000,000 shares authorized, 296,150,999 and 295,258,674 shares issued and outstanding, respectively	2,962	2,953
Additional paid-in capital	47,251	16,856
Retained earnings	1,536,342	1,424,371
Accumulated other comprehensive income	14,342	14,796
Total stockholders' equity	1,600,897	1,458,976
Total liabilities and stockholders' equity	$ 1,850,747	$ 1,684,948