CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash	$ 12,094	$ 10,455
Trade accounts receivable, net of allowances for doubtful accounts of $8,449 in 2013 and $7,204 in 2012	188,640	174,832
Inventories, net	108,806	101,422
Prepaid expenses and other current assets	3,418	3,811
Deferred income taxes	7,021	5,182
Total current assets	319,979	295,702
Property and equipment, net	60,402	58,713
Goodwill	177,258	145,788
Other intangible assets, net of accumulated amortization of $37,486 in 2013 and $31,699 in 2012	71,287	63,189
Other long-term assets	5,099	6,340
Total assets	634,025	569,732
Current liabilities:
Current maturities of long-term debt	22,057	22,057
Trade accounts payable	80,543	74,356
Accrued wages and benefits	17,404	15,216
Federal income taxes payable	0	1,696
Customer advances	6,288	2,996
Other current liabilities	22,046	12,131
Total current liabilities	148,338	128,452
Long-term debt, less current maturities	225,274	216,339
Non-current deferred income taxes	22,480	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	142	141
Additional paid-in capital	84,049	78,554
Retained earnings	160,526	133,590
Accumulated other comprehensive income	(1,629)	1,059
Treasury stock, at cost (146,871 shares at June 30, 2013 and 141,471 at December 31, 2012)	(5,171)	(4,867)
Total shareholders' equity	237,933	208,493
Total liabilities and stockholders' equity	634,025	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