Debt Instrument, Number of Instruments

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- Definition

Line of credit facility maximum leverage ratio

+ References

No definition available.

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- Definition

Ratio Of Net Indebtedness to Ebitda

+ 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.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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- 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

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Total interest costs incurred during the period and either capitalized or charged against earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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- Details

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Debt - Unsecured Term Loan (Details)		3 Months Ended		9 Months Ended
Debt - Unsecured Term Loan (Details)	Oct. 18, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) loan	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Long-term debt		$ 931,637,000		$ 931,637,000		$ 937,792,000
Line Of Credit Facility Covenant Actual Results
Debt Instrument [Line Items]
Maximum leverage ratio (as a percent)		0.238		0.238
Unsecured Term Loan \| Less than or equal to 25% \| Maximum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.25
Unsecured Term Loan \| Less than or equal to 35% \| Maximum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.35
Unsecured Term Loan \| Greater than 35% but less than or equal to 45% \| Minimum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.35
Unsecured Term Loan \| Greater than 35% but less than or equal to 45% \| Maximum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.45
Unsecured Term Loan \| Greater than 45% but less than or equal to 50% \| Minimum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.45
Unsecured Term Loan \| Greater than 45% but less than or equal to 50% \| Maximum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.5
Unsecured Term Loan \| Greater than 50% but less than or equal to 55% \| Minimum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.5
Unsecured Term Loan \| Greater than 50% but less than or equal to 55% \| Maximum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.55
Unsecured Term Loan \| Greater than 55% \| Minimum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.55
Unsecured Term Loan, $50 Million \| Greater than 25% but less than or equal to 35% \| Minimum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.25
Unsecured Term Loan, $50 Million \| Greater than 25% but less than or equal to 35% \| Maximum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.35
Unsecured Term Loan, $50 Million \| Greater than 35% but less than or equal to 45% \| Minimum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.35
Unsecured Term Loan, $50 Million \| Greater than 35% but less than or equal to 45% \| Maximum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.45
Unsecured Term Loan, $50 Million \| Greater than 45% but less than or equal to 50% \| Minimum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.45
Unsecured Term Loan, $50 Million \| Greater than 45% but less than or equal to 50% \| Maximum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.50
Unsecured Term Loan, $50 Million \| Greater than 50% but less than or equal to 55% \| Minimum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.50
Unsecured Term Loan, $50 Million \| Greater than 50% but less than or equal to 55% \| Maximum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.55
Unsecured Term Loan, $50 Million \| Greater than 55% \| Minimum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.55
Term loan \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate				1.45%
Interest incurred on the facility		$ 2,700,000	$ 2,100,000	$ 7,600,000	$ 4,200,000
Term loan \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				1.45%
Term loan \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				2.00%
Term loan \| LIBOR \| Less than or equal to 35%
Debt Instrument [Line Items]
Basis spread on variable rate				1.45%
Term loan \| LIBOR \| Greater than 35% but less than or equal to 45%
Debt Instrument [Line Items]
Basis spread on variable rate				1.60%
Term loan \| LIBOR \| Greater than 45% but less than or equal to 50%
Debt Instrument [Line Items]
Basis spread on variable rate				1.75%
Term loan \| LIBOR \| Greater than 50% but less than or equal to 55%
Debt Instrument [Line Items]
Basis spread on variable rate				1.95%
Term loan \| LIBOR \| Greater than 55%
Debt Instrument [Line Items]
Basis spread on variable rate				2.20%
Term loan \| Unsecured Term Loan
Debt Instrument [Line Items]
Number of loans \| loan				2
Debt instrument, term (in years)				5 years
Term loan \| Unsecured Term Loan, $50 Million
Debt Instrument [Line Items]
Long-term debt		$ 0		$ 0
Term loan \| Unsecured Term Loan, $50 Million \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				1.40%
Term loan \| Unsecured Term Loan, $50 Million \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				2.20%
Term loan \| Unsecured Term Loan, $50 Million \| LIBOR \| Less than or equal to 25%
Debt Instrument [Line Items]
Basis spread on variable rate				1.40%
Term loan \| Unsecured Term Loan, $50 Million \| LIBOR \| Greater than 25% but less than or equal to 35%
Debt Instrument [Line Items]
Basis spread on variable rate				1.45%
Term loan \| Unsecured Term Loan, $50 Million \| LIBOR \| Greater than 35% but less than or equal to 45%
Debt Instrument [Line Items]
Basis spread on variable rate				1.55%
Term loan \| Unsecured Term Loan, $50 Million \| LIBOR \| Greater than 45% but less than or equal to 50%
Debt Instrument [Line Items]
Basis spread on variable rate				1.75%
Term loan \| Unsecured Term Loan, $50 Million \| LIBOR \| Greater than 50% but less than or equal to 55%
Debt Instrument [Line Items]
Basis spread on variable rate				1.95%
Term loan \| Unsecured Term Loan, $50 Million \| LIBOR \| Greater than 55%
Debt Instrument [Line Items]
Basis spread on variable rate				2.20%
Subsequent Event \| Term loan \| Unsecured Term Loan, $50 Million
Debt Instrument [Line Items]
Debt instrument, term (in years)	5 years
Face amount	$ 50,000,000