Schedule II - Valuation and Qualifying Accoutns (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance Period Start	$ 52,856		$ 48,926		$ 37,015
Additions Charged (Credited) to Costs and Expenses	11,155		3,700		6,356
Deductions	0		0		0
Other	0	[1]	230	[1]	5,555	[1]
Valuation Allowances and Reserves, Balance Period End	64,011		52,856		48,926
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance Period Start	29,202		33,259		25,052
Additions Charged (Credited) to Costs and Expenses	9,181		7,597		15,112
Deductions	(5,912)		(11,654)		(6,905)
Valuation Allowances and Reserves, Balance Period End	$ 32,471		$ 29,202		$ 33,259

[1] Due to acquisitions.