SEC Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 40,839	$ 46,531	$ 140,780
Additions Charged Against Operations	11,417	9,697	(56,995)
Uncollectable Accounts Written-Off	(20,187)	(15,389)	(37,254)
Balance at End of Year	$ 32,069	$ 40,839	$ 46,531