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Dividends Declared and Paid (Details) - $ / shares |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Mar. 29, 2019 | Feb. 28, 2019 | Jan. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Equity [Abstract] |  |  |  |  |
Distributions declared per common share (in dollars per share) | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.33 | $ 0.33
LTIP units, distributions per unit (in dollars per share) | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.33 | $ 0.33

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition LTIP units, distributions. + References No definition available. + Details
Name: | wfx_RegularDistributionsOnLongTermInvestmentPlan
Namespace Prefix: | wfx_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration