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Summary Of Significant Accounting Policies (Earnings Per Share - Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Convertible Senior Notes 2025 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Convertible debt stock price trigger	$ 38.57
Convertible Senior Notes 2025 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	9,300
Convertible Senior Notes 2032 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities		8,000	8,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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