Earnings Per Share (Narrative) (Details) - $ / shares shares in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
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	$ 61.79		$ 61.79	$ 61.79
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 76.63		$ 76.63
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	2,000
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	7	0	5	84

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.

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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