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Shareholders' Equity / Partners' Capital - Restricted Stock Units (Details) - 2012 Equity Incentive Plan - Restricted stock units - shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Number of Restricted Stock Units
Restricted stock units at beginning of period (in shares)	372,375	243,875
Units awarded (in shares)	345,334	304,400
Units vested (in shares)	(111,000)	(80,125)
Units forfeited (in shares)	(11,900)	(69,100)
Restricted stock units at end of the period (in shares)	594,809	399,050

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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- 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

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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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