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Common Stock and Other Equity Related Transactions - Employee Stock Purchase Program (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Jan. 12, 2018 | Oct. 13, 2017 | Jul. 14, 2017 | Apr. 14, 2017 | Jan. 13, 2017 | Oct. 14, 2016 | Jul. 08, 2016 | Apr. 08, 2016 | Jan. 08, 2016 | Oct. 09, 2015 | Jul. 10, 2015 | Apr. 10, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Employee Stock Purchase Program [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ESPP, purchase price discount (in percentage) |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |
ESPP, issued during the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 24,715 | 17,037 | 19,788
Disclosure Regular Quarterly Distributions Declared And Paid To Common Stockholders And Common O P Unit Non Controlling Interests [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Amount Per Share (usd per share) |  | $ 0.487500 | $ 0.487500 | $ 0.487500 | $ 0.425000 | $ 0.425000 | $ 0.425000 | $ 0.425000 | $ 0.375000 | $ 0.375000 | $ 0.375000 | $ 0.375000 |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock Purchase Program [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amendment Date |  |  |  |  |  |  |  |  |  |  |  |  | May 10, 2016 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock Purchase Program [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ESPP authorized amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000 |  |
Number of shares authorized ESPP (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Regular Quarterly Distributions Declared And Paid To Common Stockholders And Common O P Unit Non Controlling Interests [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Amount Per Share (usd per share) | $ 0.4875 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amendment date for share issuance under the employee stock purchase plan. + References No definition available. + Details
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- Definition Disclosure - Regular Quarterly Distributions Declared and Paid to Common Stockholders and Common OP Unit Non-Controlling Interests [Abstract] + References No definition available. + Details
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- Definition Annual value of shares authorized for issuance for the employee stock purchase plan. + References No definition available. + Details
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- Definition [Line Items] for Details regarding the ELS Employee Stock Purchase Program + References No definition available. + Details
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- Definition Common stock purchased through our Employee Stock Purchase Program can be purchased at a price equal to 85% of the lesser of: (a) the closing price for a share of common stock on the last day of the offering period; and (b) the closing price for a share of common stock on the first day of the offering period. + References No definition available. + Details
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- Definition Number of shares authorized for issuance for the employee stock purchase plan. + References No definition available. + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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