Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 12,873	$ 12,463	$ 20,681
Receivables, net	188,294	113,859	200,640
Product inventories, net	494,321	400,308	462,810
Prepaid expenses and other current assets	13,029	11,280	12,590
Deferred income taxes	5,153	5,186	7,078
Total current assets	713,670	543,096	703,799
Property and equipment, net	48,755	46,566	45,355
Goodwill	169,983	169,983	177,103
Other intangible assets, net	10,793	11,053	11,717
Equity interest investments	1,179	1,160	1,099
Other assets, net	9,360	8,718	7,735
Total assets	953,740	780,576	946,808
Current liabilities:
Accounts payable	338,026	199,787	319,462
Accrued expenses and other current liabilities	30,413	48,186	30,111
Current portion of long-term debt and other long-term liabilities	21	23	23
Total current liabilities	368,460	247,996	349,596
Deferred income taxes	14,207	13,453	9,629
Long-term debt	278,542	230,882	299,011
Other long-term liabilities	7,549	6,622	7,006
Total liabilities	668,758	498,953	665,242
Stockholders' equity:
Common stock	46	46	48
Additional paid-in capital	286,380	276,334	250,595
Retained (deficit) earnings	(2,446)	5,377	28,913
Accumulated other comprehensive income (loss)	1,002	(134)	2,010
Total stockholders' equity	284,982	281,623	281,566
Total liabilities and stockholders' equity	$ 953,740	$ 780,576	$ 946,808