Debt And Interest Expense (Components Of Interest Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Debt Disclosure [Abstract]
Contractual interest on Convertible Debentures	$ 40,625	$ 40,625	$ 40,625
Amortization of debt discount on the Convertible Debentures	7,986	7,355	6,775
Contingent interest to holders of the Convertible Debentures	0	100,020	109,113
Interest capitalized to property and equipment, net	(934)	(980)	(676)
Other interest expense	2,519	312	1,830
Total interest expense	$ 50,196	$ 147,332	$ 157,667