CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash	$ 12,131	$ 5,469
Trade accounts receivable, net of allowance for doubtful accounts of $9,306 in 2014 and $8,798 in 2013	250,319	192,003
Inventories, net	110,703	105,271
Prepaid expenses and other current assets	5,178	2,693
Deferred income taxes	11,760	7,713
Total current assets	390,091	313,149
Property and equipment, net	70,657	58,253
Goodwill	374,089	188,110
Other intangible assets, net of accumulated amortization of $48,836 in 2014 and $44,410 in 2013	145,317	69,722
Other long-term assets	5,376	6,043
Total assets	985,530	635,277
Current liabilities:
Current maturities of long-term debt	39,142	26,213
Trade accounts payable	101,807	78,853
Accrued wages and benefits	24,952	20,473
Federal income taxes payable	4,917	853
Customer advances	4,682	3,720
Other current liabilities	23,336	18,605
Total current liabilities	198,836	148,717
Long-term debt, less current maturities	431,356	168,372
Non-current deferred income taxes	44,043	21,938
Commitments and Contingencies (Note 13)
Shareholders' equity:
Common stock, $0.01 par value, 100,000,000 shares authorized; 14,536,632 in 2014 and 14,468,485 in 2013 shares issued	146	144
Additional paid-in capital	114,685	109,892
Retained earnings	205,332	193,737
Accumulated other comprehensive income	(3,713)	(2,368)
Treasury stock, at cost (146,871 shares in 2014 and 2013)	(5,171)	(5,171)
Total shareholders' equity	311,295	296,250
Total liabilities and stockholders' equity	985,530	635,277
Series A Preferred Stock [Member]
Shareholders' equity:
Preferred stock	1	1
Series B Convertible Preferred Stock [Member]
Shareholders' equity:
Preferred stock	$ 15	$ 15