Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Current assets:
Cash and cash equivalents	$ 50,311	$ 17,487	$ 37,218
Receivables, net	270,089	110,555	266,032
Product inventories, net	402,266	386,924	389,763
Prepaid expenses and other current assets	8,437	11,298	7,692
Deferred income taxes	11,737	11,737	10,211
Total current assets	742,840	538,001	710,916
Property and equipment, net	45,409	41,394	38,732
Goodwill	177,103	177,103	178,516
Other intangible assets, net	11,497	11,738	12,221
Equity interest investments	1,089	980	1,052
Other assets, net	29,076	29,406	29,113
Total assets	1,007,014	798,622	970,550
Current liabilities:
Accounts payable	267,990	177,437	247,904
Accrued expenses and other current liabilities	87,614	53,398	79,794
Current portion of long-term debt and other long-term liabilities	22	22	100,033
Total current liabilities	355,626	230,857	427,731
Deferred income taxes	32,139	32,993	26,151
Long-term debt	309,813	247,300	206,049
Other long-term liabilities	7,058	7,726	7,663
Total liabilities	704,636	518,876	667,594
Stockholders' equity:
Common stock	47	47	48
Additional paid-in capital	256,973	243,180	232,676
Retained earnings	44,804	34,299	66,478
Accumulated other comprehensive income	554	2,220	3,754
Total stockholders' equity	302,378	279,746	302,956
Total liabilities and stockholders' equity	$ 1,007,014	$ 798,622	$ 970,550