Summary of Quarterly Results (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of Quarterly Results [Abstract]
Revenue, Net	$ 1,529,945	$ 1,501,348	$ 1,536,027	$ 1,593,068	$ 1,557,085	$ 1,544,360	$ 1,555,906	$ 1,525,571	$ 6,160,388	$ 6,182,922	$ 6,030,670
Cost of Goods and Services Sold	1,153,281	1,130,053	1,168,681	1,224,968	1,197,401	1,198,299	1,219,513	1,190,612	4,676,983	4,805,825	4,694,440
Gross Profit	376,664	371,295	367,346	368,100	359,684	346,061	336,393	334,959	1,483,405	1,377,097	1,336,230
Selling, General and Administrative Expense	214,090	203,550	201,878	200,124	199,902	191,293	192,474	190,166	819,642	773,835	747,608
Provision for Doubtful Accounts	26,851	24,047	24,078	24,431	25,410	24,255	24,357	24,530	99,407	98,552	136,630
Litigation And Other Professional Fees	11,148	4,931	26,093	7,203	23,103	6,742	19,816	6,013	49,375	55,674	113,709
Other Cost and Expense, Operating	2,046	5,036	49,209	11,512	5,154	6,718	2,332	1,889	67,803	16,093	149,129
Operating Income (Loss)	122,529	133,731	66,088	124,830	106,115	117,053	97,414	112,361	447,178	432,943	189,154
Interest Income (Expense), Net	29,659	39,036	35,574	30,834	36,080	55,926	33,730	34,382	(135,103)	(160,118)	(155,646)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	92,870	94,695	30,514	93,996	70,035	61,127	63,684	77,979	312,075	272,825	33,508
Income Tax Expense (Benefit)	33,852	33,270	11,822	38,257	31,723	23,343	27,403	28,824	117,201	111,293	19,044
Income (loss) from continuing operations	59,018	61,425	18,692	55,739	38,312	37,784	36,281	49,155	194,874	161,532	14,464
Loss from discontinued operations	0	0	0		(7,129)	(9,900)	(37,728)	(19,851)	0	(74,608)	(120,573)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	59,018	61,425	18,692	55,739	31,183	27,884	(1,447)	29,304	194,874	86,924	(106,109)
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.55	$ 0.56	$ 0.17	$ 0.50	$ 0.34	$ 0.34	$ 0.32	$ 0.43	$ 1.78	$ 1.43	$ 0.12
Basic earnings per share, discontinued operations (per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ (0.06)	$ (0.09)	$ (0.33)	$ (0.17)	$ 0.00	$ (0.66)	$ (1.04)
Earnings Per Share, Basic	$ 0.55	$ 0.56	$ 0.17	$ 0.50	$ 0.28	$ 0.25	$ (0.01)	$ 0.26	$ 1.78	$ 0.77	$ (0.91)
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0.54	$ 0.55	$ 0.17	$ 0.48	$ 0.34	$ 0.33	$ 0.32	$ 0.43	$ 1.73	$ 1.41	$ 0.13
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ (0.06)	$ (0.09)	$ (0.33)	$ (0.17)	$ 0.00	$ (0.65)	$ (1.03)
Earnings Per Share, Diluted	$ 0.54	$ 0.55	$ 0.17	$ 0.48	$ 0.27	$ 0.24	$ (0.01)	$ 0.26	$ 1.73	$ 0.76	$ (0.91)
Dividends per common share	$ 0.1400	$ 0.1400	$ 0.0700	$ 0.0700	$ 0.0400	$ 0.0400	$ 0.0400	$ 0.0325	$ 0.4200	$ 0.1525
Weighted Average Number of Shares Outstanding, Basic	106,773	109,315	110,580	111,487	111,687	112,729	113,487	114,129	109,531	113,000	116,348
Weighted Average Number of Shares Outstanding, Diluted	110,074	111,951	113,472	116,500	114,344	114,644	114,701	115,064	112,988	114,781	116,927
Comprehensive income	$ 58,226	$ 63,354	$ 17,003	$ 56,161	$ 32,006	$ 24,002	$ (981)	$ 25,925	$ 194,744	$ 80,952