Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 341,841	$ 175,384
Accounts receivable, net	175,524	134,043
Inventories	319,286	324,409
Prepaid expenses and other current assets	43,896	39,643
Deferred income taxes	23,051	16,184
Total current assets	903,598	689,663
Property and equipment, net	180,850	159,135
Intangible assets, net	4,483	5,535
Deferred income taxes	22,606	15,885
Other long term assets	45,546	48,992
Total assets	1,157,083	919,210
Current liabilities
Accounts payable	143,689	100,527
Accrued expenses	85,077	69,285
Current maturities of long term debt	9,132	6,882
Other current liabilities	14,330	6,913
Total current liabilities	252,228	183,607
Long term debt, net of current maturities	52,757	70,842
Other long term liabilities	35,176	28,329
Total liabilities	340,161	282,778
Commitments and contingencies (see Note 7)
Stockholders’ equity
Additional paid-in capital	321,338	268,206
Retained earnings	493,181	366,164
Accumulated other comprehensive income	2,368	2,028
Total stockholders’ equity	816,922	636,432
Total liabilities and stockholders’ equity	1,157,083	919,210
Class A Common Stock
Stockholders’ equity
Common Stock	28	27
Total stockholders’ equity	28	27
Class B Convertible Common Stock
Stockholders’ equity
Common Stock	7	7
Total stockholders’ equity	$ 7	$ 7