Fair Value Measurements (Estimated Fair Value Of Other Financial Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 11, 2012 Two Point Five Percentage Convertible Notes [Member]	Nov. 13, 2013 Three Point Zero Percentage Convertible Notes [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			2.50%	3.00%
Cash, Cash Equivalents and Restricted Cash	$ 539,610	$ 276,489
Cash, Cash Equivalents and Restricted Cash, Fair Value Disclosure					539,610	276,489	0	0	0	0
Investment Owned, at Cost	9,315	9,315
Notes, Loans and Financing Receivable, Gross, Noncurrent	13,544	26,063
Debt, Long-term and Short-term, Combined Amount	879,441	677,229
Long-term Debt, Fair Value					$ 0	$ 0	$ 1,094,193	$ 747,973	$ 0	$ 0