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

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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

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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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The amount of cash bonuses and distributions related to all dividends previously declared on restricted shares and options expected to vest in the future.

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Share-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of cash bonuses and distributions related to all dividends previously declared on unvested shares			$ 0.2
Stock based compensation expense	$ 3.9	$ 3.8	$ 9.9	$ 5.3
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of restricted shares granted	20,394		297,833	995,669
Vested (in shares)			892,921	43,996
Restricted Shares \| Three Year Vesting Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of restricted shares granted	4,653		278,854
Vested (in shares)	15,741		18,979
Vesting period from grant date	3 years		3 years
Stock Options and Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of cash bonuses and distributions related to all dividends previously declared on unvested shares			$ 1.3		$ 1.3