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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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Number of shares authorized for issuance under share-based payment arrangement.

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Remaining Shares Authorized

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Share-based Compensation Arrangement by Share-based Payment Award, Period of Volume of Weighted Average Price

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Share-based Compensation Arrangement by Share-based Payment Award, Trading Days

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Share-Based Compensation - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($) shares	Dec. 31, 2019 USD ($) day shares	Dec. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs \| $		$ 7,800
Weighted-average cost		1 year 8 months 12 days
Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)		12,750,000
Remaining shares authorized (in shares)		11,899,660
Time-Based Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	124,000	177,000	172,000
Period of volume of weighted average price \| day		10
Trading days \| day		10
Performance-Based Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		158,000	133,000
General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General and administrative \| $	$ 1,385	$ 5,223	$ 2,342
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		0 years
Minimum \| Time-Based Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Minimum \| Performance-Based Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate		2.50%
Expected volatility rate		13.30%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
Maximum \| Time-Based Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
Maximum \| Performance-Based Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate		2.70%
Expected volatility rate		20.00%