Represents the price of common stock at grant date used for awards under the share-based compensation plan.

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

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- Definition

Aggregate number of common shares reserved for future issuance.

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No definition available.

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- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

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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- 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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- 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.

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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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No definition available.

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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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- 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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No definition available.

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- Definition

Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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Equity - Restricted Stock and performance-based stock units (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
2015 Plan
Stock Based Compensation Plans
Total shares reserved for issuance		617,013			1,400,000
Restricted stock and performance-based stock units
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	345,633	325,750	244,181	210,573
Granted (in shares)		147,608	156,718	143,057
Vested (in shares)		(127,725)	(75,149)	(85,343)
Canceled (in shares)				(24,106)
Outstanding at the end of the year (in shares)		345,633	325,750	244,181
Compensation expense
Compensation expense related to share-based award		$ 6,566	$ 5,870	$ 5,247
Remaining compensation expense		$ 7,311
Restricted stock and performance-based stock units \| 2020
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	139,534
Outstanding at the end of the year (in shares)		139,534
Compensation expense
Remaining compensation expense		$ 4,619
Restricted stock and performance-based stock units \| 2021
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	119,168
Outstanding at the end of the year (in shares)		119,168
Compensation expense
Remaining compensation expense		$ 2,503
Restricted stock and performance-based stock units \| 2022
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	86,931
Outstanding at the end of the year (in shares)		86,931
Compensation expense
Remaining compensation expense		$ 189
Restricted stock and performance-based stock units \| Grant Date Price $38.18 \| Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)			81,819
Price per share			$ 38.18
Restricted stock and performance-based stock units \| Grant Date Price $38.18 \| TSR Targets
Restricted stock and performance based stock units activity
Granted (in shares)			66,171
Price per share			$ 38.18
Restricted stock and performance-based stock units \| Grant Date Price $41.25 \| Vesting Date, May 30, 2019
Restricted stock and performance based stock units activity
Granted (in shares)			8,728
Price per share			$ 41.25
Restricted stock and performance-based stock units \| Grant Date Price $45.76 \| Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)				74,760
Price per share				$ 45.76
Vesting period		3 years
Restricted stock and performance-based stock units \| Grant Date Price $45.76 \| TSR Targets
Restricted stock and performance based stock units activity
Granted (in shares)				57,881
Price per share				$ 45.76
Vesting period		4 years
Restricted stock and performance-based stock units \| Grant Date Price $45.76 \| Accelerated TSR Targets
Restricted stock and performance based stock units activity
Vesting period		3 years
Restricted stock and performance-based stock units \| Grant Date Price $48.55 \| Vesting Date, June 1, 2018
Restricted stock and performance based stock units activity
Granted (in shares)				7,416
Price per share				$ 48.55
Restricted stock and performance-based stock units \| Grant Date Price $50.50 \| Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)				3,000
Price per share				$ 50.50
Vesting period				3 years
Restricted stock and performance-based stock units \| Grant Date Price $43.24 \| Three year vesting
Restricted stock and performance based stock units activity
Vesting period			3 years	3 years
Restricted stock and performance-based stock units \| Grant Date Price $46.54 \| Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)		78,276
Price per share		$ 46.54
Restricted stock and performance-based stock units \| Grant Date Price $46.54 \| TSR Targets
Restricted stock and performance based stock units activity
Granted (in shares)		60,836
Price per share		$ 46.54
Restricted stock and performance-based stock units \| Grant Date Price $44.73 \| Vesting Date, May 29, 2020
Restricted stock and performance based stock units activity
Granted (in shares)		8,496
Price per share		$ 44.73
Performance-based stock units
Restricted stock and performance based stock units activity
Vested (in shares)		(48,225)
Performance-based stock units \| 2020
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	55,057
Outstanding at the end of the year (in shares)		55,057
Performance-based stock units \| 2021
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	66,171
Outstanding at the end of the year (in shares)		66,171
Performance-based stock units \| 2022
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	60,836
Outstanding at the end of the year (in shares)		60,836
Subsequent Event \| Restricted stock and performance-based stock units \| 2015 Plan \| Grant Date Price $38.18
Stock Based Compensation Plans
Stock options granted (in shares)	76,464
Restricted stock and performance based stock units activity
Granted (in shares)	76,464
Price per share	$ 48.95
Subsequent Event \| Restricted stock and performance-based stock units \| 2015 Plan \| Grant Date Price $38.18 \| Three year vesting
Restricted stock and performance based stock units activity
Vesting period	3 years