Summary of Accounting Policies (Schedule of Goodwill) (Details) (USD $) In Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2008	Mar. 31, 2011		Mar. 31, 2010
Summary of Accounting Policies
Balance, beginning of the year, net of accumulated impairment of $5,949,977		$ 84,360		$ 36,776
Additions		7,119	[1]	17,635	[1]
Impairment	5,900,000	5,949,977		5,949,977
Purchase accounting adjustments and reclassification to other intangibles		1,170	[2]	31,646	[2]
Foreign currency translation adjustments		558		(1,697)
Balance, end of period, net of accumulated impairment of $5,949,977		$ 93,207		$ 84,360

[1] For fiscal years 2011 and 2010, additions were attributable to certain acquisitions that were not individually, nor in the aggregate, significant to the Company. Refer to the discussion of the Company's acquisitions in Note 11, "Business and Asset Acquisitions and Divestitures."

[2] Includes adjustments and reclassifications resulting from management's review and finalization of the valuation of assets and liabilities acquired through certain business combinations completed in a period subsequent to the respective acquisition, based on management's estimates. Adjustments and reclassifications during fiscal years 2011 and 2010 were attributable to purchase accounting adjustments for certain historical acquisitions that were not individually, nor in the aggregate, significant to the Company. Refer to the discussion of the Company's acquisitions in Note 11, "Business and Asset Acquisitions and Divestitures."