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Earnings Per Share (Anti-dilutive Shares) (Details) shares in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 trading_day shares | Dec. 31, 2016 shares | Dec. 31, 2015 shares | Sep. 30, 2017
Joint venture shares |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive shares | 255 | 0 | 298 |
3.00% convertible senior unsecured notes |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive shares | 0 | 14,764 | 16,992 |
Stated interest rate (as a percent) | 3.00% |  |  |
Series J convertible perpetual preferred stock |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive shares | 15,635 | 15,635 | 15,635 |
1.50% convertible senior unsecured notes |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive shares | 0 | 9,868 | 11,567 |
Stated interest rate (as a percent) | 1.50% |  |  |
Unvested Time Based Units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive shares | 6 | 16 |  |
Market-based Units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive shares | 17 | 125 |  |
3.125% senior convertible notes |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Stated interest rate (as a percent) | 3.125% |  |  | 3.125%
Threshold consecutive trading days | trading_day | 40 |  |  |

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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 -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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