XML 59 R43.htm IDEA: XBRL DOCUMENT v3.20.4

Equity-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement, Noncash Expense [Abstract]

Summary of Compensation Expense Connection with Awards

The Company recognized the following compensation expense in connection with awards that vested under the 2018 Plan, the 2015 Plan, the Prior Plan, and the Non-Employee Directors Plan along with the related tax benefits recognized during the years ended December 31 (in thousands):

			2020						2019						2018
Expense recognized under the Prior Plan			$	40					$	192					$	569
Expense recognized under the 2015 Plan			1,932						5,077						7,988
Expense recognized under the 2018 Plan			5,441						6,731						188
Expense recognized under the Non-Employee Directors Plan			760						570						444
Total stock compensation expense			$	8,173					$	12,570					$	9,189
Tax benefits recognized related to stock compensation expense			$	2,272					$	3,136					$	2,509

Schedule of Number of Awards and Weighted Average Grant Date Fair Value

The following table provides the number of stock options, stock units, and common stock granted during the years ended December 31, along with the weighted-average grant-date fair value of each award:

			2020												2019												2018
Awards			Number of Awards						Weighted Average Grant Date Fair Value						Number of Awards						Weighted Average Grant Date Fair Value						Number of Awards						Weighted Average Grant Date Fair Value
Deferred stock units			12,402						$	45.98					7,509						$	37.95					10,255						$	35.96
Common stock			4,134						$	45.98					7,509						$	37.95					2,113						$	35.50
Restricted stock units			81,397						$	56.81					152,472						$	39.73					116,174						$	36.61
Performance stock units			160,426						$	55.98					183,908						$	40.49					135,929						$	33.63

Summary of Ranges of Outstanding and Exercisable Options

The following table summarizes the ranges of outstanding and exercisable options at December 31, 2020:

Range of Exercise Prices						Options Outstanding						Weighted Average Remaining Contractual Life (in years)						Weighted Average Exercise Price						Options Exercisable						Weighted Average Exercise Price
$8.00 – $10.00						16,500						0.7						$	9.74					16,500						$	9.74
$10.01 – $39.00						—						0						$	—					—						$	—
$39.01 – $44.00						25,000						1.4						$	42.35					25,000						$	42.35
						41,500																		41,500

Summary of Stock Options Transactions

The following table summarizes information about stock option transactions:

			Options						Weighted Average Exercise Price						Weighted Average Remaining Contractual Life (in years)						Aggregate Intrinsic Value
Balance at January 1, 2018			247,666						$	17.01
Exercised			(87,907)						15.75
Balance at December 31, 2018			159,759						$	17.70
Exercised			(42,350)						11.57
Balance at December 31, 2019			117,409						$	19.91
Exercised			(75,909)						14.73
Balance at December 31, 2020			41,500						$	29.38					1.13						$	1,766,000

Summary of Information About Restricted Stock Units and Weighted Average Grant Date Fair Value

The following table summarizes information about non-vested restricted stock units, performance stock units (that will convert to shares upon vesting) and common stock:

			Restricted Stock Units						Weighted Average Grant Date Fair Value						Common Stock						Weighted Average Grant Date Fair Value						Performance Stock Units (1) (2)						Weighted Average Grant Date Fair Value						Deferred Stock Units (3)						Weighted Average Grant Date Fair Value
Balance at December 31, 2019			374,432						$	33.74					—						$	—					329,257						$	38.53					34,752						$	34.21
Granted			82,328						$	56.81					4,134						$	45.98					160,426						$	55.98					12,402						$	45.98
Adjustments			—						$	—					—						$	—					27,528						$	40.98					—						$	—
Vested			(213,448)						$	34.14					(4,134)						$	45.98					(81,366)						$	40.77					—						$	—
Forfeited			(5,870)						$	40.92					—						$	—					(28,556)						$	40.27					—						$	—
Balance at December 31, 2020			237,442						$	41.15					—						$	—					407,289						$	45.00					47,154						$	37.30

(1) The Company’s performance stock units (“PSUs”) represent shares granted for which the final number of shares earned depends on financial performance or market conditions. The number of shares to be issued may vary between 0% and 200% of the number of performance stock units granted depending on the relative achievement to targeted thresholds. The Company's PSUs with a financial performance condition are based on either the Company’s return on invested capital (“ROIC”) over a one-year period performance period or revenue, gross profit, and operating profit thresholds over a two-year or three-year performance period. The Company's PSUs with a market condition are based on the ranking of the Company’s total shareholder return (“TSR”) performance, on a percentile basis, over a three year performance period compared to the S&P Small Cap Industrial sector, over the same three year performance period.

(2) The Company's PSU adjustments during 2020 represent additional shares granted for achievement in excess of targeted thresholds at the end of the performance period. The Company's PSUs with a financial performance condition, based on the Company’s ROIC, granted in 2019 accounted for 23,628 units of the total adjustments at a final achievement ratio of 116%. The Company's PSUs with a market condition, based on the relative ranking of the Company’s TSR performance, granted in 2017 accounted for the remaining 3,900 units at final achievement ratio of 115.6%.

(3) Vested and issued upon termination from service as a member of the Company's Board of Directors.

Aggregate Intrinsic Value of Options Exercised and Aggregate Fair Value of Restricted Stock Units and Restricted Shares that Vested

The following table sets forth the aggregate intrinsic value of options exercised and aggregate fair value of restricted stock units and restricted shares that vested during the years ended December 31 (in thousands):

			2020						2019						2018
Aggregate intrinsic value of options exercised			$	3,812					$	1,371					$	2,128
Aggregate fair value of vested restricted stock units			$	11,851					$	10,017					$	5,307
Aggregate fair value of vested common and restricted shares			$	190					$	285					$	149
Aggregate fair value of vested deferred stock units			$	570					$	285					$	369

Cash Paid to Settle Liability Awards

The following table provides the number of restricted stock units credited to active participant accounts, balance of vested and unvested restricted stock units within active participant accounts, payments made with respect to restricted stock units issued under the MSPP, and MSPP expense during years ended December 31:

			2020						2019						2018
Restricted stock units credited			57,046						61,369						66,843
Restricted stock units balance, vested and unvested			231,343						415,760						387,870
Share-based liabilities paid, in thousands			$	15,401					$	6,543					$	5,232
MSPP expense, in thousands			$	4,518					$	2,699					$	4,809

X

- Definition

Cash Paid To Settle Liability Awards [Table Text Block]

+ References

No definition available.

+ Details

Name:	rock_CashPaidToSettleLiabilityAwardsTableTextBlock
Namespace Prefix:	rock_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Disclosure of the intrinsic value of options exercised and fair value of restricted stock and restricted stock units vested during the period.

+ References

No definition available.

+ Details

Name:	rock_ScheduleOfFairValueOfOptionsExercisedAndOtherAwardsVestedTableTextBlock
Namespace Prefix:	rock_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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

X

- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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

X

- Definition

Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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

X

- Definition

Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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