Supplemental Guarantor Information Consolidating Condensed Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Current Assets
Cash and cash equivalents	$ 32,668	$ 34,924	$ 32,632	$ 48,462
Trade receivables, net	255,359	247,974
Installment receivables, net	4,542	6,671
Inventories, net	214,155	192,761
Deferred income taxes	1,038	1,620
Other current assets	46,096	44,820
Total Current Assets	553,858	528,770
Investment in subsidiaries	0	0
Intercompany advances, net	0	0
Other Assets	42,834	42,647
Other Intangibles	80,577	83,320
Property and Equipment, net	128,185	129,712
Goodwill	495,095	496,605
Total Assets	1,300,549	1,281,054
Current Liabilities
Accounts payable	160,974	148,805
Accrued expenses	124,991	132,595
Accrued income taxes	150	1,495
Short-term debt and current maturities of long-term obligations	7,371	5,044
Total Current Liabilities	293,486	287,939
Long-Term Debt	260,276	260,440
Other Long-Term Obligations	109,706	106,150
Inercompany advances, net	0	0
Total Shareholders' Equity	637,081	626,525
Total Liabilities and Shareholders' Equity	1,300,549	1,281,054
The Company (Parent) [Member]
Current Assets
Cash and cash equivalents	4,061	3,642	5,113	4,036
Trade receivables, net	81,068	83,522
Installment receivables, net	0	0
Inventories, net	40,103	45,937
Deferred income taxes	422	422
Other current assets	9,875	10,171
Total Current Assets	135,529	143,694
Investment in subsidiaries	1,581,133	1,560,693
Intercompany advances, net	80,537	79,598
Other Assets	41,167	40,813
Other Intangibles	737	821
Property and Equipment, net	44,034	45,459
Goodwill	0	0
Total Assets	1,883,137	1,871,078
Current Liabilities
Accounts payable	73,251	73,948
Accrued expenses	32,694	37,708
Accrued income taxes	13	508
Short-term debt and current maturities of long-term obligations	6,566	4,210
Total Current Liabilities	112,524	116,374
Long-Term Debt	252,967	252,855
Other Long-Term Obligations	49,050	47,873
Inercompany advances, net	831,515	827,451
Total Shareholders' Equity	637,081	626,525
Total Liabilities and Shareholders' Equity	1,883,137	1,871,078
Combined Guarantor Subsidiaries [Member]
Current Assets
Cash and cash equivalents	2,463	2,104	1,317	2,476
Trade receivables, net	80,116	74,161
Installment receivables, net	1,146	1,180
Inventories, net	57,070	49,336
Deferred income taxes	45	45
Other current assets	6,758	6,517
Total Current Assets	147,598	133,343
Investment in subsidiaries	527,199	524,800
Intercompany advances, net	850,233	846,829
Other Assets	549	698
Other Intangibles	25,768	26,838
Property and Equipment, net	18,905	17,770
Goodwill	55,893	54,894
Total Assets	1,626,145	1,605,172
Current Liabilities
Accounts payable	18,476	18,078
Accrued expenses	22,211	21,038
Accrued income taxes	0	0
Short-term debt and current maturities of long-term obligations	0	4
Total Current Liabilities	40,687	39,120
Long-Term Debt	207	227
Other Long-Term Obligations	8,313	7,312
Inercompany advances, net	214,195	210,005
Total Shareholders' Equity	1,362,743	1,348,508
Total Liabilities and Shareholders' Equity	1,626,145	1,605,172
Combined Non-Guarantor Subsidiaries [Member]
Current Assets
Cash and cash equivalents	26,144	29,178	26,202	41,950
Trade receivables, net	94,175	90,291
Installment receivables, net	3,396	5,491
Inventories, net	118,944	99,006
Deferred income taxes	571	1,153
Other current assets	33,013	33,812
Total Current Assets	276,243	258,931
Investment in subsidiaries	0	0
Intercompany advances, net	209,049	200,157
Other Assets	1,118	1,136
Other Intangibles	54,072	55,661
Property and Equipment, net	65,246	66,483
Goodwill	439,202	441,711
Total Assets	1,044,930	1,024,079
Current Liabilities
Accounts payable	69,247	56,779
Accrued expenses	73,636	79,529
Accrued income taxes	137	987
Short-term debt and current maturities of long-term obligations	805	830
Total Current Liabilities	143,825	138,125
Long-Term Debt	7,102	7,358
Other Long-Term Obligations	52,343	50,965
Inercompany advances, net	94,111	89,128
Total Shareholders' Equity	747,549	738,503
Total Liabilities and Shareholders' Equity	1,044,930	1,024,079
Eliminations [Member]
Current Assets
Cash and cash equivalents	0	0	0	0
Trade receivables, net	0	0
Installment receivables, net	0	0
Inventories, net	(1,962)	(1,518)
Deferred income taxes	0	0
Other current assets	(3,550)	(5,680)
Total Current Assets	(5,512)	(7,198)
Investment in subsidiaries	(2,108,332)	(2,085,493)
Intercompany advances, net	(1,139,819)	(1,126,584)
Other Assets	0	0
Other Intangibles	0	0
Property and Equipment, net	0	0
Goodwill	0	0
Total Assets	(3,253,663)	(3,219,275)
Current Liabilities
Accounts payable	0	0
Accrued expenses	(3,550)	(5,680)
Accrued income taxes	0	0
Short-term debt and current maturities of long-term obligations	0	0
Total Current Liabilities	(3,550)	(5,680)
Long-Term Debt	0	0
Other Long-Term Obligations	0	0
Inercompany advances, net	(1,139,821)	(1,126,584)
Total Shareholders' Equity	(2,110,292)	(2,087,011)
Total Liabilities and Shareholders' Equity	$ (3,253,663)	$ (3,219,275)