Equity Incentive Plan - Schedule of LTIP Unit Awards (Details) - Long Term Incentive Plan Units - $ / shares		12 Months Ended
Jun. 01, 2015	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of Shares, Nonvested at beginning of the period (in shares)		598,320	476,398	482,056
Number of Shares, Granted (in shares)	183,300	325,507	221,853	244,917
Number of Shares, Vested (in shares)		(254,218)	(99,931)	(67,275)
Number of shares forfeited (in shares)		0	0	(183,300)
Number of Shares, Nonvested at end of the period (in shares)		669,609	598,320	476,398
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted - Average Grant Date Fair Value, Nonvested at beginning of the period (in dollars per share)		$ 18.30	$ 17.73	$ 16.58
Weighted - Average Grant Date Fair Value, Granted (in dollars per share)	$ 14.13	13.42	18.73	16.94
Weighted - Average Grant Date Fair Value, Vested (in dollars per share)		18.82	16.55	16.42
Weighted - Average Grant Date Fair Value, Forfeited (in dollars per share)		0	0	14.13
Weighted - Average Grant Date Fair Value, Nonvested at end of the period (in dollars per share)		$ 15.73	$ 18.30	$ 17.73

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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The weighted average fair value at grant date for nonvested equity-based awards issued 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

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-Publisher FASB
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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Publisher FASB
-Name Accounting Standards Codification
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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