Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Trade Receivables [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance	$ 202,602	$ 264,105	$ 352,417	$ 396,907
Valuation Allowances and Reserves, Charged to Cost and Expense	99,561	97,995	97,034
Valuation Allowances and Reserves, Adjustments	(161,064)	(186,307)	(141,524)
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance	24,159	21,037	20,502	18,418
Valuation Allowances and Reserves, Charged to Cost and Expense	5,431	3,765	4,151
Valuation Allowances and Reserves, Adjustments	$ (2,309)	$ (3,230)	$ (2,067)