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Earnings Per Share (Anti-dilutive Shares) (Details) - shares shares in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Joint venture shares
Anti-dilutive shares
Anti-dilutive shares	[1]	298	298	298	298
3.00% convertible senior unsecured notes
Anti-dilutive shares
Anti-dilutive shares	[1]	16,992	16,992	16,992	16,992
Series J convertible perpetual preferred stock
Anti-dilutive shares
Anti-dilutive shares	[1]	15,635	15,635	15,635	15,635
1.50% convertible senior unsecured notes
Anti-dilutive shares
Anti-dilutive shares	[1]	11,567	11,567	11,567	11,567
[1] For the three and six months ended June 30, 2015 and 2014, the effect of the Company's unvested Units, performance-based Units, CSEs and restricted stock awards were anti-dilutive.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Antidilution



-URI http://asc.fasb.org/extlink&oid=6505113



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Diluted Earnings Per Share



-URI http://asc.fasb.org/extlink&oid=6510752



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Contingent Stock Agreement



-URI http://asc.fasb.org/extlink&oid=6508534



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 260



-SubTopic 10



-Section 50



-Paragraph 1



-Subparagraph (c)



-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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