Debt And Interest Expense (Components Of Interest Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Disclosure [Abstract]
Contractual interest on Convertible Debentures	$ 40,625	$ 40,625	$ 40,625
Interest Expense, Debt	34,688	24,570	0
Amortization of debt discount on the Convertible Debentures	9,412	8,670	7,986
Interest capitalized to property and equipment, net	(707)	(1,218)	(934)
Other interest expense	1,976	2,114	2,519
Total interest expense	$ 85,994	$ 74,761	$ 50,196