Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 105,940	$ 58,506
Marketable securities	453	451
Trade accounts receivable, net of allowance for doubtful accounts of $10,588 and $9,248, respectively	502,330	414,331
Inventories	818,771	784,068
Deferred income tax assets	17,279	18,248
Prepaid income taxes	0	24,869
Other current assets	111,009	107,988
Total current assets	1,555,782	1,408,461
Property and equipment, less accumulated depreciation	714,912	654,850
Other assets, net	12,279	12,473
Total assets	2,282,973	2,075,784
Current liabilities:
Line of credit	70,000	0
Accounts payable	109,488	91,253
Accrued expenses	166,625	148,579
Income taxes payable	5,350	0
Total current liabilities	351,463	239,832
Deferred income tax liabilities	63,386	63,255
Stockholders' equity:
Preferred stock, 5,000,000 shares authorized	0	0
Common stock, 400,000,000 shares authorized, 296,764,444 and 296,753,544 shares issued and outstanding, respectively	2,968	2,968
Additional paid-in capital	70,631	69,847
Retained earnings	1,782,873	1,688,781
Accumulated other comprehensive income	11,652	11,101
Total stockholders' equity	1,868,124	1,772,697
Total liabilities and stockholders' equity	$ 2,282,973	$ 2,075,784