Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Current assets:
Cash and cash equivalents	$ 26,936	$ 12,463	$ 50,311
Receivables, net	281,064	113,859	269,060
Product inventories, net	424,679	400,308	402,266
Prepaid expenses and other current assets	10,219	11,280	8,437
Deferred income taxes	5,103	5,186	7,098
Total current assets	748,001	543,096	737,172
Property and equipment, net	51,110	46,566	45,409
Goodwill	169,983	169,983	177,103
Other intangible assets, net	10,592	11,053	11,497
Equity interest investments	1,190	1,160	1,089
Other assets, net	9,133	8,718	7,857
Total assets	990,009	780,576	980,127
Current liabilities:
Accounts payable	239,976	199,787	267,990
Accrued expenses and other current liabilities	79,844	48,186	83,609
Current portion of long-term debt and other long-term liabilities	20	23	22
Total current liabilities	319,840	247,996	351,621
Deferred income taxes	15,263	13,453	9,257
Long-term debt	300,426	230,882	309,813
Other long-term liabilities	7,871	6,622	7,058
Total liabilities	643,400	498,953	677,749
Stockholders' equity:
Common stock	47	46	47
Additional paid-in capital	297,120	276,334	256,973
Retained (deficit) earnings	48,605	5,377	44,804
Accumulated other comprehensive income (loss)	837	(134)	554
Total stockholders' equity	346,609	281,623	302,378
Total liabilities and stockholders' equity	$ 990,009	$ 780,576	$ 980,127