CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash	$ 12,093	$ 5,469
Trade accounts receivable, net of allowance for doubtful accounts of $10,761 in 2014 and $8,798 in 2013	281,872	193,341
Inventories, net	111,858	105,271
Prepaid expenses and other current assets	5,180	2,693
Deferred income taxes	8,317	7,713
Total current assets	419,320	314,487
Property and equipment, net	72,021	58,253
Goodwill	372,829	188,110
Other intangible assets, net of accumulated amortization of $53,688 in 2014 and $44,410 in 2013	146,928	69,722
Other long-term assets	5,045	6,043
Total assets	1,016,143	636,615
Current liabilities:
Current maturities of long-term debt	39,022	26,213
Trade accounts payable	109,741	78,853
Accrued wages and benefits	23,939	20,473
Federal income taxes payable	1,931	853
Customer advances	5,648	3,720
Other current liabilities	22,594	19,943
Total current liabilities	202,875	150,055
Long-term debt, less current maturities	452,798	168,372
Non-current deferred income taxes	39,241	21,938
Commitments and Contingencies (Note 13)
Shareholders' equity:
Common stock, $0.01 par value, 100,000,000 shares authorized; 14,444,511 in 2014 and 14,468,485 in 2013 shares issued	146	144
Additional paid-in capital	114,379	109,892
Retained earnings	220,849	193,737
Accumulated other comprehensive income	(3,038)	(2,368)
Treasury stock, at cost (214,724 shares in 2014 and 146,871 in 2013)	(11,123)	(5,171)
Total shareholders' equity	321,229	296,250
Total liabilities and stockholders' equity	1,016,143	636,615
Series A Preferred Stock [Member]
Shareholders' equity:
Preferred stock	1	1
Series B Convertible Preferred Stock [Member]
Shareholders' equity:
Preferred stock	$ 15	$ 15