XML 80 R66.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Shareholders' Equity (Details) |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2018 shares | Mar. 01, 2017 shares | Jan. 28, 2016 shares | Jun. 01, 2015 shares | Dec. 31, 2017 USD ($) $ / shares shares | Jan. 31, 2014 USD ($) | Dec. 31, 2018 USD ($) vote $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Common shares, shares authorized (up to) (in shares) |  |  |  |  | 500,000,000 |  | 500,000,000 | 500,000,000 |
Common shares, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.01 |  | $ 0.01 | $ 0.01 |
Number of votes per common share | vote |  |  |  |  |  |  | 1 |  |
Common shares, shares outstanding (in shares) |  |  |  |  | 45,375,266 |  | 46,525,652 | 45,375,266 |
Proceeds from issuance of common shares | $ |  |  |  |  |  |  | $ 24,486,000 | $ 150,691,000 | $ 482,000
Preferred shares, shares authorized (up to) (in shares) |  |  |  |  | 100,000,000 |  | 100,000,000 | 100,000,000 |
Preferred shares, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.01 |  | $ 0.01 | $ 0.01 |
Preferred stock, shares outstanding (in shares) |  |  |  |  | 0 |  | 0 | 0 |
Operating partnership common units held by unaffiliated third parties (in shares) |  |  |  |  | 0 |  | 0 | 0 |
Long Term Incentive Plan Units |  |  |  |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Percent of units with full parity that have vested |  |  |  |  |  |  | 100.00% |  |
Shares granted (in shares) |  |  |  | 183,300 |  |  | 244,917 | 223,922 | 112,251
Class A Performance LTIP Units |  |  |  |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Distribution entitlement (in percentage) |  |  |  | 10.00% |  |  |  |  |
Long Term Incentive Plan Units, Time-Based |  |  |  |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Shares granted (in shares) | 97,968 | 89,574 | 72,966 |  |  |  |  |  |
DRSP Plan |  |  |  |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Additional common shares issued (in shares) |  |  |  |  |  |  | 1,508,046 | 741,730 |
Stock purchase plan, authorized amount | $ |  |  |  |  | $ 50,000,000 | $ 25,000,000 |  |  |
Weighted average price per share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 21.55 | $ 21.00 |
Remaining authorized repurchase amount | $ |  |  |  |  |  |  | $ 32,500,000 |  |
New DRSPP |  |  |  |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Additional common shares issued (in shares) |  |  |  |  |  |  | 766,574 |  |
Weighted average price per share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 22.08 |  |
Proceeds from issuance of common shares | $ |  |  |  |  |  |  | $ 16,900,000 |  |
ATM Plan |  |  |  |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Common shares, shares outstanding (in shares) |  |  |  |  |  |  | 350,975 |  |
Additional common shares issued (in shares) |  |  |  |  |  |  | 2,498,670 | 2,147,695 |
Stock purchase plan, authorized amount | $ |  |  |  |  | $ 100,000,000 | $ 50,000,000 |  |  |
Weighted average price per share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 21.83 | $ 21.87 |
Proceeds from issuance of common shares | $ |  |  |  |  |  |  | $ 7,600,000 |  |
Remaining authorized repurchase amount | $ |  |  |  |  |  |  | $ 92,400,000 |  |

X
- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_CommonStockSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_CommonStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_PreferredStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_PreferredStockSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_PreferredStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of new stock issued during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: 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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Common Share, Number Of Votes Per Common Share + References No definition available. + Details
Name: | wfx_CommonShareNumberOfVotesPerCommonShare
Namespace Prefix: | wfx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Operating Partnership Units Held by Unaffiliated Third Parties + References No definition available. + Details
Name: | wfx_OperatingPartnershipUnitsHeldbyUnaffiliatedThirdParties
Namespace Prefix: | wfx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Awards Vested To Date, Percentage + References No definition available. + Details
Name: | wfx_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardsVestedToDatePercentage
Namespace Prefix: | wfx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Distribution Entitlement, Percentage + References No definition available. + Details
Name: | wfx_SharebasedCompensationArrangementbySharebasedPaymentAwardDistributionEntitlementPercentage
Namespace Prefix: | wfx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock Purchase Plan, Authorized Amount + References No definition available. + Details
Name: | wfx_StockPurchasePlanAuthorizedAmount
Namespace Prefix: | wfx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Stock Purchase Plan, Average Price Per Share + References No definition available. + Details
Name: | wfx_StockPurchasePlanAveragePricePerShare
Namespace Prefix: | wfx_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock Purchase Plan, Remaining Authorized Repurchase Amount + References No definition available. + Details
Name: | wfx_StockPurchasePlanRemainingAuthorizedRepurchaseAmount
Namespace Prefix: | wfx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Stockholders Equity Note Disclosure [Line Items] + References No definition available. + Details
Name: | wfx_StockholdersEquityNoteDisclosureLineItems
Namespace Prefix: | wfx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=wfx_LongTermIncentivePlanUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=wfx_ClassAPerformanceLTIPUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=wfx_LongTermIncentivePlanUnitsTimeBasedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=wfx_DRSPPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=wfx_NewDRSPPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=wfx_ATMPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |