Schedule II – Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance, Beginning Balance	$ 27,862	$ 22,379	$ 18,844
Charged to Cost and Expenses	139,274	21,983	20,340
Charge-off Against Allowances	(53,779)	(16,500)	(16,805)
Valuation Allowances and Reserves, Balance, Ending Balance	$ 113,357	$ 27,862	$ 22,379