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Earnings Per Share (Narrative) (Details) - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Anitidlutive securities exluded from computation of earnings per share [Line Items] |  |  |
Exercise price range, lower limit | $ 61.79 | $ 61.79 |
Exercise price range, upper limit | $ 76.63 | $ 76.63 | $ 61.79
Series C Cumulative Convertible Preferred Share [Member] |  |  |
Anitidlutive securities exluded from computation of earnings per share [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 2,100 | 2,100 | 2,000
Preferred share dividend percentage | 5.75% |  |
Series E Cumulative Convertible Preferred Share [Member] |  |  |
Anitidlutive securities exluded from computation of earnings per share [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 1,600 | 1,600 | 1,600
Preferred share dividend percentage | 9.00% |  |
Stock Options [Member] |  |  |
Anitidlutive securities exluded from computation of earnings per share [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 26 | 7 | 72

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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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- Definition The ceiling 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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