Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 121,166	$ 114,496
Trade accounts receivable, net of allowance for doubtful accounts of $12,178 and $12,619, respectively	537,650	462,077
Inventories	876,697	869,224
Deferred income tax assets	20,653	21,765
Other current assets	107,207	115,703
Total current assets	1,663,373	1,583,265
Property and equipment, less accumulated depreciation	805,854	763,889
Other assets, net	11,705	11,948
Total assets	2,480,932	2,359,102
Current liabilities:
Line of credit, current	79,575	90,000
Accounts payable	133,472	103,909
Accrued expenses	182,397	174,002
Income taxes payable	1,132	7,442
Total current liabilities	396,576	375,353
Line of credit, noncurrent	250,425	0
Deferred income tax liabilities	69,947	68,532
Stockholders' equity:
Preferred stock, 5,000,000 shares authorized	0	0
Common stock, 400,000,000 shares authorized, 290,149,384 and 295,867,844 shares issued and outstanding, respectively	2,902	2,959
Additional paid-in capital	2,934	33,744
Retained earnings	1,781,645	1,886,350
Accumulated other comprehensive loss	(23,497)	(7,836)
Total stockholders' equity	1,763,984	1,915,217
Total liabilities and stockholders' equity	$ 2,480,932	$ 2,359,102