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Income per Unit (Summary of Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Class of Stock [Line Items] |  |
Net income available to common unitholders | $ 86,298 | $ 66,145
Weighted average shares/units outstanding-basic (shares/units) | 205,714,173 | 159,297,027
Potentially dilutive common units: |  |
Stock options (units) | 0 | 4
Unvested incentive units (units) | 302,016 | 237,336
Forward equity offering (units) | 0 | 283,388
Market performance-based awards (units) | 491,287 | 603,900
Weighted average shares/units outstanding-diluted (shares/units) | 206,507,476 | 160,421,655
Income per share: |  |
Basic (in dollars per share/unit) | $ 0.42 | $ 0.42
Diluted (in dollars per share/unit) | $ 0.42 | $ 0.41
Digital Realty Trust, L.P. |  |
Class of Stock [Line Items] |  |
Net income available to common unitholders | $ 89,778 | $ 67,049
Weighted average shares/units outstanding-basic (shares/units) | 214,009,460 | 161,474,901
Potentially dilutive common units: |  |
Stock options (units) | 0 | 4
Unvested incentive units (units) | 302,016 | 237,336
Forward equity offering (units) | 0 | 283,388
Market performance-based awards (units) | 491,287 | 603,900
Weighted average shares/units outstanding-diluted (shares/units) | 214,802,763 | 162,599,529
Income per share: |  |
Basic (in dollars per share/unit) | $ 0.42 | $ 0.42
Diluted (in dollars per share/unit) | $ 0.42 | $ 0.41

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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