Class B Unit valuation assumptions risk free rate

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- Definition

Class B Units valuation assumption dividend yield

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- Definition

class B units issued during period

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- Definition

ClassBUnit valuation assumption expected volatility

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- Definition

class b units outstanding

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- Definition

class b units unearned and unvested

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- Definition

class b units unearned and vested

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- Definition

common stock fair value per share; an input for Monte Carlo valuation of Class B Units.

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- Definition

market vesting condition capital increase threshhold

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- Definition

risk free rate max year horizon for interpolation

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risk free rate min year horizon for interpolation

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section S99
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The number of units converted into shares of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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.

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Equity Compensation Class B Units (Details) - USD ($)	12 Months Ended
Equity Compensation Class B Units (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 03, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 1.0475	$ 1.02	$ 0.94
Share-based Compensation	$ 1,223,000	$ 1,703,000	$ 3,470,000
market vesting condition capital increase threshhold		$ 5,660,580
ClassBUnits [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
common stock fair value per share				$ 20.19
Common Stock, Dividends, Per Share, Declared		$ 0.25
Share-based Compensation		$ 93,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	20 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		256,087
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum	30 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 4,266,409
Class B Units valuation assumption dividend yield				4.95%
ClassBUnit valuation assumption expected volatility				25.70%
Class B Unit valuation assumptions risk free rate				2.71%
100percentvestinglevel [Member] \| ClassBUnits [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 16.66
one year [Member] \| ClassBUnits [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		171,988
three year [Member] \| ClassBUnits [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		84,099
2018 Service Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
class B units issued during period	256,087
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(189,264)
Partners' Capital Account, Units, Converted	0
class b units unearned and unvested	32,575
class b units unearned and vested	34,248
class b units outstanding	66,823
2017 Service Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
class B units issued during period	286,392
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(5,334)
Partners' Capital Account, Units, Converted	(254,730)
class b units unearned and unvested	0
class b units unearned and vested	26,328
class b units outstanding	26,328
Executive Officer [Member] \| 2018 Service Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(128,258)
Executive Officer [Member] \| 2017 Service Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0
Former CEO - John A. Williams [Member] \| 2018 Service Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(38,284)
Former CEO - John A. Williams [Member] \| 2017 Service Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0
Other OP Unit Participants [Member] \| 2018 Service Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(22,722)
Other OP Unit Participants [Member] \| 2017 Service Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(5,334)