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Debt - Subsequent Events (Details) - USD ($)		1 Months Ended	6 Months Ended
	Jul. 25, 2019	Jan. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Debt repaid			$ 6,863,000	$ 6,781,000
Unsecured credit facility
Debt Instrument [Line Items]
Accordion feature, higher borrowing capacity			$ 1,200,000,000
Unsecured credit facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.50%
Unsecured credit facility | Senior Unsecured Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 300,000,000
Accordion feature, higher borrowing capacity			$ 600,000,000
Interest rate			3.91%
Unsecured credit facility | Senior Unsecured Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.50%
Unsecured Term Loan
Debt Instrument [Line Items]
Debt instrument, term (in years)			5 years
Unsecured Term Loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.45%
Unsecured Term Loan | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate			1.40%
Unsecured Term Loan | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate			2.20%
Unsecured Term Loan | Unsecured Term Loan Due May 2021
Debt Instrument [Line Items]
Principal balance			$ 100,000,000		$ 100,000,000
Interest rate			3.89%
Unsecured Term Loan | Unsecured Term Loan Due May 2021 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.45%
Unsecured Term Loan | Unsecured Term Loan Due April 2022
Debt Instrument [Line Items]
Principal balance			$ 200,000,000		200,000,000
Interest rate			3.89%
Unsecured Term Loan | Unsecured Term Loan Due April 2022 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.45%
Unsecured Term Loan | $50 Million Term Loan
Debt Instrument [Line Items]
Principal balance			$ 50,000,000		$ 50,000,000
Interest rate			3.86%
Unsecured Term Loan | $50 Million Term Loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.45%
Subsequent Event | Unsecured credit facility
Debt Instrument [Line Items]
Debt repaid	$ 50,000,000
Subsequent Event | Unsecured credit facility | Senior Unsecured Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 400,000,000
Subsequent Event | Unsecured credit facility | Senior Unsecured Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.40%
Subsequent Event | Unsecured credit facility | Senior Unsecured Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.05%
Subsequent Event | Unsecured Term Loan | $350 Million Unsecured Term Loan
Debt Instrument [Line Items]
Debt instrument, term (in years)	5 years
Principal balance	$ 350,000,000
Subsequent Event | Unsecured Term Loan | $350 Million Unsecured Term Loan | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%
Subsequent Event | Unsecured Term Loan | $350 Million Unsecured Term Loan | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Subsequent Event | Unsecured Term Loan | Unsecured Term Loan Due May 2021
Debt Instrument [Line Items]
Debt repaid	$ 100,000,000
Subsequent Event | Unsecured Term Loan | Unsecured Term Loan Due April 2022
Debt Instrument [Line Items]
Debt repaid	200,000,000
Subsequent Event | Unsecured Term Loan | Unsecured Term Loan, $175 Million portion of $350 Million
Debt Instrument [Line Items]
Principal balance	$ 175,000,000
Interest Rate Swap | Unsecured Term Loan | $50 Million Term Loan | LIBOR Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		2.41%
Interest Rate Swap | Subsequent Event | Unsecured Term Loan | Unsecured Term Loan, $175 Million portion of $350 Million | LIBOR Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.70%

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- Definition

Line of Credit Facility, Accordion Feature, Higher Borrowing Capacity Option

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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