XML 81 R59.htm IDEA: XBRL DOCUMENT v3.19.3

Stockholders' Equity - Narrative (Details) - USD ($)		1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Aug. 20, 2018	Mar. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Mar. 31, 2018
Conversion of Stock [Line Items]
Common stock, outstanding (shares)			89,458,340			89,458,340		76,080,625
Preferred stock, authorized (shares)			16,670,000			16,670,000		16,670,000
Common stock dividend rate (usd per share)		$ 2.13		$ 2.13
Common stock, monthly dividend rate (usd per share)				$ 0.1775
Public Offering
Conversion of Stock [Line Items]
Number of shares issued (shares)	4,600,000
Gross proceeds from sale of stock	$ 95,000,000.0
Sale of stock (usd per share)	$ 20.65
Offering transaction costs	$ 3,800,000
Additional offering transaction costs	$ 300,000
Underwriters
Conversion of Stock [Line Items]
Number of shares issued (shares)	600,000
Agent | At-the-Market Program
Conversion of Stock [Line Items]
Number of shares issued (shares)			5,596,452	7,759,322	164,927	13,555,774	164,927
Gross proceeds from sale of stock			$ 109,900,000	$ 152,800,000	$ 3,500,000	$ 262,600,000	$ 3,500,000
Commissions paid			1,600,000	1,500,000	35,140,000	3,100,000	35,140,000
Payments of stock offering costs			$ 200,000	800,000	$ 300,000	$ 1,000,000.0	$ 300,000
Aggregate common stock offering price				$ 175,000,000.0
Redeemable Preferred Stock
Conversion of Stock [Line Items]
Preferred stock, authorized (shares)			13,409,650			13,409,650		13,409,650
Preferred stock, issued (shares)			6,682,448			6,682,448		5,416,890
Dividend payout (usd per share)						$ 0.453125
Preferred stock, dividend rate						7.25%		7.25%
Preferred stock, liquidation preference (usd per share)			$ 25.00			$ 25.00		$ 25
Redeemable Preferred Stock | Maximum
Conversion of Stock [Line Items]
Periods for dividend payment						30 days
Redeemable Preferred Stock | Minimum
Conversion of Stock [Line Items]
Periods for dividend payment						10 days
Redeemable Preferred Stock | Agent | At-the-Market Program
Conversion of Stock [Line Items]
Number of shares issued (shares)			724,600		3,225	1,265,558	7,240
Gross proceeds from sale of stock			$ 18,500,000		$ 81,009,000	$ 32,300,000
Commissions paid			300,000		1,215,000	500,000	$ 2,724,000
Payments of stock offering costs			$ 100,000		$ 100,000	$ 200,000	400,000
Aggregate preferred stock offering price									$ 200,000,000.0
Net proceeds							$ 200,000

X

- Definition

Common Stock, Dividend Rate, Per Share

+ References

No definition available.

+ Details

Name:	gnl_CommonStockDividendRatePerShare
Namespace Prefix:	gnl_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Common Stock, Monthly Dividend Rate, Per Share

+ References

No definition available.

+ Details

Name:	gnl_CommonStockMonthlyDividendRatePerShare
Namespace Prefix:	gnl_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Common Stock, Value of Shares Authorized

+ References

No definition available.

+ Details

Name:	gnl_CommonStockValueSharesAuthorized
Namespace Prefix:	gnl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Payments Of Stock Issuance Costs, Commissions

+ References

No definition available.

+ Details

Name:	gnl_PaymentsOfStockIssuanceCostsCommissions
Namespace Prefix:	gnl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Preferred Stock, Dividend Payment, Period

+ References

No definition available.

+ Details

Name:	gnl_PreferredStockDividendPaymentPeriod
Namespace Prefix:	gnl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Preferred Stock, Vale, Shares Authorized

+ References

No definition available.

+ Details

Name:	gnl_PreferredStockValeSharesAuthorized
Namespace Prefix:	gnl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Sale Of Stock, Additional Transaction Costs

+ References

No definition available.

+ Details

Name:	gnl_SaleOfStockAdditionalTransactionCosts
Namespace Prefix:	gnl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Sale Of Stock, Consideration Received Per Transaction, Gross

+ References

No definition available.

+ Details

Name:	gnl_SaleOfStockConsiderationReceivedPerTransactionGross
Namespace Prefix:	gnl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Sale Of Stock, Transaction Costs

+ References

No definition available.

+ Details

Name:	gnl_SaleOfStockTransactionCosts
Namespace Prefix:	gnl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfStockIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount per share used to calculated dividend payments on preferred stock.

+ References

No definition available.

+ Details

Name:	us-gaap_PreferredStockDividendRatePerDollarAmount
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

+ Details

Name:	us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: 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

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(d)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644

+ Details

Name:	us-gaap_PreferredStockLiquidationPreference
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

Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

+ 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_PreferredStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=gnl_PublicOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=gnl_AgentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=gnl_AttheMarketProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_RedeemablePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: