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Dividends declared (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Apr. 28, 2014 | Feb. 18, 2014 | Nov. 01, 2013 | Jul. 30, 2013 | May 07, 2013 | Jan. 17, 2013
Dividends declared/paid [Abstract] |  |  |  |  |  |  |
Minimum Percentage Of Taxable Income To Be Distributed As REIT | 90.00% |  |  |  |  |  |
Distribution Per Share |  | $ 0.57 | $ 0.57 | $ 0.55 | $ 0.5 | $ 0.5 | $ 0.5
Aggregate Payment Amount (in millions) |  | $ 41.5 | $ 41.1 | $ 39.6 | $ 36.1 | $ 35.8 | $ 35.7

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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