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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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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- References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

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

+ References

No definition available.

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Equity - Restricted Stock and performance-based stock units (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
2015 Plan
Stock Based Compensation Plans
Total shares reserved for issuance		1,048,000		1,400,000
Restricted stock
Restricted stock and performance based stock units activity
Granted (in shares)		143,057	127,087	92,150
Restricted stock \| 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 \| 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 \| Grant Date Price $45.76 \| Accelerated TSR Targets
Restricted stock and performance based stock units activity
Vesting period		3 years
Restricted stock \| 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 \| 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 \| Grant Date Price $43.24 \| Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)			65,300
Price per share			$ 43.24
Vesting period			3 years
Restricted stock \| Grant Date Price $46.87 \| TSR Targets
Restricted stock and performance based stock units activity
Granted (in shares)			54,107
Price per share			$ 46.87
Vesting period			3 years 8 months 12 days
Restricted stock \| 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 \| Grant Date Price $46.87 \| Vesting Date, June 1, 2017
Restricted stock and performance based stock units activity
Granted (in shares)			7,680
Price per share			$ 46.87
Restricted stock \| Grant Date Price $44.45 \| Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)				65,750
Price per share				$ 44.45
Vesting period				3 years
Restricted stock \| Grant Date Price $42.30 \| Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)				18,000
Price per share				$ 42.30
Vesting period				3 years
Restricted stock \| Grant Date Price $42.30 \| Vesting Date, June 2, 2016
Restricted stock and performance based stock units activity
Granted (in shares)				8,400
Price per share				$ 42.30
Restricted stock and performance-based stock units
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	244,181	210,573	187,347	214,168
Granted (in shares)		143,057	127,087	92,150
Vested (in shares)		(85,343)	(103,861)	(118,331)
Canceled (in shares)		(24,106)		(640)
Outstanding at the end of the year (in shares)		244,181	210,573	187,347
Compensation expense
Compensation expense related to share-based award		$ 5,247	$ 4,265	$ 3,992
Remaining compensation expense		$ 6,355
Restricted stock and performance-based stock units \| 2018
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	75,149
Outstanding at the end of the year (in shares)		75,149
Compensation expense
Remaining compensation expense		$ 3,947
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)	92,218
Outstanding at the end of the year (in shares)		92,218
Compensation expense
Remaining compensation expense		$ 2,149
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)	76,814
Outstanding at the end of the year (in shares)		76,814
Compensation expense
Remaining compensation expense		$ 259
Performance-based stock units \| 2019
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	54,107
Outstanding at the end of the year (in shares)		54,107
Performance-based stock units \| 2020
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	57,881
Outstanding at the end of the year (in shares)		57,881
Subsequent Event \| Restricted stock \| 2015 Plan \| Grant Date Price $38.18
Stock Based Compensation Plans
Stock options granted (in shares)	147,990
Restricted stock and performance based stock units activity
Granted (in shares)	147,990
Price per share	$ 38.18
Subsequent Event \| Restricted stock \| 2015 Plan \| Grant Date Price $38.18 \| Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)	81,819
Vesting period	3 years
Subsequent Event \| Restricted stock \| 2015 Plan \| Grant Date Price $38.18 \| TSR Targets
Restricted stock and performance based stock units activity
Granted (in shares)	66,171
Vesting period	4 years
Subsequent Event \| Restricted stock \| 2015 Plan \| Grant Date Price $38.18 \| Accelerated TSR Targets
Restricted stock and performance based stock units activity
Vesting period	3 years