Summary of Quarterly Results (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of Quarterly Results [Abstract]
Revenue, Net	$ 1,627,938	$ 1,608,055	$ 1,610,584	$ 1,571,038	$ 1,536,169	$ 1,515,168	$ 1,503,116	$ 1,458,945	$ 6,417,615	$ 6,013,398	$ 5,878,464
Cost of Goods and Services Sold	1,273,538	1,256,595	1,256,354	1,212,584	1,176,497	1,163,197	1,143,601	1,109,241	4,999,071	4,592,536	4,483,042
Gross Profit	354,400	351,460	354,230	358,454	359,672	351,971	359,515	349,704	1,418,544	1,420,862	1,395,422
Selling, General and Administrative Expense	174,884	178,940	184,063	186,813	190,904	182,668	191,915	190,693	724,700	756,180	772,004
Provision for Doubtful Accounts	21,898	19,911	21,090	21,561	24,448	24,963	26,140	24,010	84,460	99,561	97,995
Litigation And Other Professional Fees	15,351	12,868	7,547	7,052	(2,150)	143,484	3,512	22,619	42,818	167,465	49,375
Other Cost and Expense, Operating	113,694	3,999	11,284	10,276	2,896	61,632	31,268	4,006	139,253	99,802	65,713
Operating Income (Loss)	28,573	135,742	130,246	132,752	143,574	(60,776)	106,680	108,376	427,313	297,854	410,335
Interest Income (Expense), Net	(41,809)	(28,717)	(29,980)	(29,441)	(29,859)	(34,925)	(29,624)	(29,462)	(129,947)	(123,870)	(135,103)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	(13,236)	107,025	100,266	103,311	113,715	(95,701)	77,056	78,914	297,366	173,984	275,232
Income Tax Expense (Benefit)	(4,487)	38,948	39,020	39,673	55,088	(26,350)	29,754	30,600	113,154	89,092	103,289
Income (loss) from continuing operations	(8,749)	68,077	61,246	63,638	58,627	(69,351)	47,302	48,314	184,212	84,892	171,943
Loss from discontinued operations	2,700	(3,246)	(39,275)	136	(142,323)	3,042	4,917	6,040	(39,685)	(128,324)	22,931
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(6,049)	64,831	21,971	63,774	(83,696)	(66,309)	52,219	54,354	144,527	(43,432)	194,874
Income (Loss) from Continuing Operations, Per Basic Share	$ (0.09)	$ 0.70	$ 0.63	$ 0.65	$ 0.58	$ (0.68)	$ 0.46	$ 0.47	$ 1.89	$ 0.83	$ 1.57
Basic earnings per share, discontinued operations (per share)	$ 0.03	$ (0.03)	$ (0.40)	$ 0.00	$ (1.42)	$ 0.03	$ 0.05	$ 0.06	$ (0.41)	$ (1.26)	$ 0.21
Earnings Per Share, Basic	$ (0.06)	$ 0.67	$ 0.23	$ 0.65	$ (0.83)	$ (0.65)	$ 0.51	$ 0.53	$ 1.48	$ (0.43)	$ 1.78
Income (Loss) from Continuing Operations, Per Diluted Share	$ (0.09)	$ 0.65	$ 0.58	$ 0.59	$ 0.54	$ (0.68)	$ 0.43	$ 0.45	$ 1.74	$ 0.78	$ 1.52
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.03	$ (0.03)	$ (0.37)	$ 0.00	$ (1.31)	$ 0.03	$ 0.04	$ 0.06	$ (0.37)	$ (1.17)	$ 0.20
Earnings Per Share, Diluted	$ (0.06)	$ 0.61	$ 0.21	$ 0.59	$ (0.77)	$ (0.65)	$ 0.48	$ 0.51	$ 1.36	$ (0.39)	$ 1.73
Dividends per common share	$ 0.22	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.14	$ 0.14	$ 0.14	$ 0.82	$ 0.62
Weighted Average Number of Shares Outstanding, Basic	97,538	97,019	96,999	98,566	100,470	101,811	102,867	103,210	97,524	102,080	109,531
Weighted Average Number of Shares Outstanding, Diluted	97,538	105,548	106,054	107,767	108,980	101,811	109,931	107,466	106,228	109,449	112,988
Comprehensive income	$ (6,939)	$ 65,170	$ 22,015	$ 63,997	$ (83,323)	$ (66,305)	$ 52,145	$ 54,330	$ 144,243	$ (43,153)