XML 87 R36.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

SHARE-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2019

SHARE-BASED COMPENSATION

Summary of the Company's restricted stock unit award program

​

​	​	​	​	​	​	​
​	​	​	​	Weighted-Average		​
​		​	​	Grant Date		​
​	​	Units	​	Fair Value		​
Outstanding – January 1, 2019	​	1,436,983	​	$	25.81	​
Granted	​	386,840	​	$	27.75	​
Vested	​	(170,935)	​	$	39.60	​
Forfeited(1)	​	(35,768)	​	$	25.97	​
Outstanding – December 31, 2019	​	1,617,120	​	$	24.82	​

(1) Forfeitures are recognized as they occur.

Schedule of restricted stock units granted during the year

The Compensation Committee of the Company’s Board of Directors granted RSUs during the years ended December 31, 2019, 2018, and 2017 as follows:

​

k

​	​	​	​	​	​	​
​	​	​	​	Weighted-Average
​	​	​	​	Grant Date
​		Units		Fair Value
2019		386,840	​	$	27.75	​
2018		231,510	​	$	44.50	​
2017		504,550	​	$	16.39	​

X

- Definition

Tabular disclosure of the weighted-average grant-date fair value of restricted stock units granted during the year.

+ References

No definition available.

+ Details

Name:	arcb_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockUnitsGrantsInPeriodWeightedAverageGrantDateFairValueTableTextBlock
Namespace Prefix:	arcb_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the change in restricted stock units (RSUs).

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfUnvestedRestrictedStockUnitsRollForwardTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration