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

No definition available.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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No definition available.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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- 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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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, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
2015 Plan
Stock Based Compensation Plans
Total shares reserved for issuance		825,457			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)	325,750	244,181	210,573	187,347
Granted (in shares)		156,718	143,057	127,087
Vested (in shares)		(75,149)	(85,343)	(103,861)
Canceled (in shares)			(24,106)
Outstanding at the end of the year (in shares)		325,750	244,181	210,573
Compensation expense
Compensation expense related to share-based award		$ 5,870	$ 5,247	$ 4,265
Remaining compensation expense		$ 6,698
Restricted stock and performance-based stock units \| 2019
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	128,214
Outstanding at the end of the year (in shares)		128,214
Compensation expense
Remaining compensation expense		$ 4,250
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)	104,085
Outstanding at the end of the year (in shares)		104,085
Compensation expense
Remaining compensation expense		$ 2,210
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)	93,451
Outstanding at the end of the year (in shares)		93,451
Compensation expense
Remaining compensation expense		$ 238
Restricted stock and performance-based stock units \| Grant Date Price $41.25 \| One year Vesting
Restricted stock and performance based stock units activity
Vesting period		1 year
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)		81,819
Price per share		$ 38.18
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)		66,171
Price per share		$ 38.18
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 \| One year Vesting
Restricted stock and performance based stock units activity
Granted (in shares)			7,416
Price per share			$ 48.55
Vesting period		1 year
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)		8,728
Price per share		$ 41.25
Restricted stock and performance-based stock units \| Grant Date Price $50.50 \| Three year vesting
Restricted stock and performance based stock units activity
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
Granted (in shares)			74,760	65,300
Price per share			$ 45.76	$ 43.24
Vesting period			3 years	3 years
Restricted stock and performance-based stock units \| Grant Date Price $46.87 \| Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)			3,000
Price per share			$ 50.50
Restricted stock and performance-based stock units \| Grant Date Price $46.87 \| TSR Targets
Restricted stock and performance based stock units activity
Granted (in shares)			57,881	54,107
Price per share			$ 45.76	$ 46.87
Vesting period				3 years 8 months 12 days
Restricted stock and performance-based stock units \| Grant Date Price $46.87 \| Accelerated TSR Targets
Restricted stock and performance based stock units activity
Vesting period				2 years 8 months 12 days
Restricted stock and performance-based stock units \| Grant Date Price $46.87 \| One year Vesting
Restricted stock and performance based stock units activity
Granted (in shares)				7,680
Price per share				$ 46.87
Vesting period				1 year
Performance-based stock units \| 2019
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	49,728
Outstanding at the end of the year (in shares)		49,728
Performance-based stock units \| 2020
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	53,554
Outstanding at the end of the year (in shares)		53,554
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
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)	139,112
Restricted stock and performance based stock units activity
Granted (in shares)	139,112
Price per share	$ 46.54
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
Granted (in shares)	78,276
Vesting period	3 years
Subsequent Event \| Restricted stock and performance-based stock units \| 2015 Plan \| Grant Date Price $38.18 \| TSR Targets
Restricted stock and performance based stock units activity
Granted (in shares)	60,836
Vesting period	4 years
Subsequent Event \| Restricted stock and performance-based stock units \| 2015 Plan \| Grant Date Price $38.18 \| Accelerated TSR Targets
Restricted stock and performance based stock units activity
Vesting period	3 years