Incentive Plan - Restricted Stock Activity (Details) - 2014 Incentive Plan - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restricted Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Stock-based awards, beginning of period (in shares)	1,020,000	813,752	909,892	709,487
Granted (in shares)	144,518	96,140	270,536	221,829
Vested (in shares)	0	0	(15,910)	(21,424)
Stock-based awards, end of period (in shares)	1,164,518	909,892	1,164,518	909,892
Amortization expense	$ 1,284	$ 1,007	$ 3,373	$ 2,759
Restricted Common Stock, Stock in Lieu of Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (in shares)	36,349	14,862	92,104	72,391
Restricted Common Stock, Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (in shares)	108,169	81,278	178,432	149,438

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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).

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

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