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Earnings Per Share (Narrative) (Details) - $ / shares shares in Thousands, $ / shares in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Anitidlutive securities exluded from computation of earnings per share [Line Items] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit |  |  | $ 0 | $ 0
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit |  |  | $ 0 | $ 0
Series C Cumulative Convertible Preferred Share [Member] |  |  |  |
Anitidlutive securities exluded from computation of earnings per share [Line Items] |  |  |  |
Common shares upon conversion of convertible preferred shares | 2,100 | 2,100 | 2,100 |
Preferred share dividend percentage | 5.75% | 5.75% | 5.75% | 5.75%
Series E Cumulative Convertible Preferred Share [Member] |  |  |  |
Anitidlutive securities exluded from computation of earnings per share [Line Items] |  |  |  |
Common shares upon conversion of convertible preferred shares | 1,600 | 1,600 | 1,600 | 1,600
Preferred share dividend percentage | 9.00% | 9.00% | 9.00% | 9.00%
Share Options [Member] |  |  |  |
Anitidlutive securities exluded from computation of earnings per share [Line Items] |  |  |  |
Common shares upon conversion of convertible preferred shares | 86 | 5 | 86 | 5

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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 The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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