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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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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