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Earnings Per Share (Anti-dilutive Shares) (Details) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Anti-dilutive shares |  |  |  |  |
Anti-dilutive shares |  |  | 21 |  |
Joint venture shares |  |  |  |  |
Anti-dilutive shares |  |  |  |  |
Anti-dilutive shares | [1],[2] | 298,000 | 0 | 298,000 | 298,000
3.00% convertible senior unsecured notes |  |  |  |  |
Anti-dilutive shares |  |  |  |  |
Anti-dilutive shares | [1],[2] | 16,992,000 | 0 | 16,992,000 | 16,992,000
Series J convertible perpetual preferred stock |  |  |  |  |
Anti-dilutive shares |  |  |  |  |
Anti-dilutive shares | [1],[2] | 15,635,000 | 0 | 15,635,000 | 15,635,000
1.50% convertible senior unsecured notes |  |  |  |  |
Anti-dilutive shares |  |  |  |  |
Anti-dilutive shares | [1],[2] | 11,567,000 | 0 | 11,567,000 | 11,567,000
[1] | For the three and nine months ended September 30, 2015 and for the nine months ended September 30, 2014, the effect of the Company's unvested Units, performance-based Units, CSEs and restricted stock awards were anti-dilutive.
[2] | For the three months ended September 30, 2014, the effect of 21 unvested performance-based Units 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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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