Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 20,681	$ 17,487	$ 11,420
Receivables, net	201,792	110,555	173,787
Product inventories, net	462,810	386,924	438,791
Prepaid expenses and other current assets	12,590	11,298	6,850
Deferred income taxes	11,737	11,737	10,211
Total current assets	709,610	538,001	641,059
Property and equipment, net	45,355	41,394	34,746
Goodwill	177,103	177,103	178,516
Other intangible assets, net	11,717	11,738	12,597
Equity interest investments	1,099	980	903
Other assets, net	29,381	29,406	28,822
Total assets	974,265	798,622	896,643
Current liabilities:
Accounts payable	319,462	177,437	303,395
Accrued expenses and other current liabilities	34,240	53,398	29,096
Current portion of long-term debt and other long-term liabilities	23	22	100,064
Total current liabilities	353,725	230,857	432,555
Deferred income taxes	32,957	32,993	25,870
Long-term debt	299,011	247,300	180,157
Other long-term liabilities	7,006	7,726	7,491
Total liabilities	692,699	518,876	646,073
Stockholders' equity:
Common stock	48	47	48
Additional paid-in capital	250,595	243,180	226,554
Retained earnings	28,913	34,299	22,426
Accumulated other comprehensive income	2,010	2,220	1,542
Total stockholders' equity	281,566	279,746	250,570
Total liabilities and stockholders' equity	$ 974,265	$ 798,622	$ 896,643