CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash	$ 8,271	$ 10,455
Trade accounts receivable, net of allowances for doubtful accounts of $8,962 in 2013 and $7,204 in 2012	196,036	174,832
Inventories, net	110,207	101,422
Prepaid expenses and other current assets	3,692	3,811
Deferred income taxes	7,158	5,182
Total current assets	325,364	295,702
Property and equipment, net	60,751	58,713
Goodwill	186,847	145,788
Other intangible assets, net of accumulated amortization of $46,471 in 2013 and $31,699 in 2012	73,412	63,189
Other long-term assets	5,127	6,340
Total assets	651,501	569,732
Current liabilities:
Current maturities of long-term debt	23,776	22,057
Trade accounts payable	91,918	74,356
Accrued wages and benefits	23,741	15,216
Federal income taxes payable	8,033	1,696
Customer advances	5,047	2,996
Other current liabilities	7,162	12,131
Total current liabilities	159,677	128,452
Long-term debt, less current maturities	212,375	216,339
Non-current deferred income taxes	22,492	16,448
Commitments and Contingencies (Note 13)
Shareholders' equity:
Common stock, $0.01 par value, 100,000,000 shares authorized; 14,210,158 in 2013 and 14,118,348 in 2012 shares issued	143	141
Additional paid-in capital	84,374	78,554
Retained earnings	176,855	133,590
Accumulated other comprehensive income	740	1,059
Treasury stock, at cost (146,871 shares in 2013 and 141,471 in 2012)	(5,171)	(4,867)
Total shareholders' equity	256,957	208,493
Total liabilities and stockholders' equity	651,501	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