CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash	$ 7,235	$ 10,455
Trade accounts receivable, net of allowances for doubtful accounts of $7,751 in 2013 and $7,204 in 2012	189,292	174,832
Inventories, net	99,719	101,422
Prepaid expenses and other current assets	3,363	3,811
Deferred income taxes	6,725	5,182
Total current assets	306,334	295,702
Property and equipment, net	58,824	58,713
Goodwill	147,347	145,788
Other intangible assets, net of accumulated amortization of $34,341 in 2013 and $31,699 in 2012	58,131	63,189
Other long-term assets	4,972	6,340
Total assets	575,608	569,732
Current liabilities:
Current maturities of long-term debt	22,057	22,057
Trade accounts payable	78,617	74,356
Accrued wages and benefits	15,189	15,216
Federal income taxes payable	4,921	1,696
Customer advances	7,998	2,996
Other current liabilities	11,352	12,131
Total current liabilities	140,134	128,452
Long-term debt, less current maturities	198,231	216,339
Non-current deferred income taxes	15,488	16,448
Commitments and Contingencies (Note 13)
Shareholders' equity:
Common stock, $0.01 par value, 100,000,000 shares authorized; 14,141,780 in 2013 and 14,118,348 in 2012 shares issued	141	141
Additional paid-in capital	79,649	78,554
Retained earnings	146,797	133,590
Accumulated other comprehensive income	19	1,059
Treasury stock, at cost (141,471 shares at March 31, 2013 and at December 31, 2012)	(4,867)	(4,867)
Total shareholders' equity	221,755	208,493
Total liabilities and stockholders' equity	575,608	569,732
Series A Preferred Stock [Member]
Shareholders' equity:
Preferred stock	1	1
Series B Convertible Preferred Stock [Member]
Shareholders' equity:
Preferred stock	$ 15	$ 15