Equity-Based compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Equity-Based Compensation Expense

The following table summarizes the compensation expense included in selling, general and administrative expenses in the Consolidated Statements of Earnings related to stock-based compensation plans:

	Years Ended December 31,
	2018		2017		2016
Service-Based RSUs	$	2,036	$	1,762	$	1,997
Performance-Based RSUs	3,089		2,350		665
Cash-settled awards	131		72		76
Total	$	5,256	$	4,184	$	2,738
Income tax benefit	1,188		1,573		1,029
Net	$	4,068	$	2,611	$	1,709

Schedule of Unrecognized Equity-Based Compensation Expense

The following table summarizes the unrecognized compensation expense related to non-vested RSUs by type and the weighted-average period in which the expense is to be recognized:

	Unrecognized compensation expense at December 31, 2018		Weighted- average period
Service-Based RSUs	$	1,598	1.21
Performance-Based RSUs	2,539		1.56
Total	$	4,137	1.43

Summary of Status of Equity-Based Compensation Plans

The following table summarizes the status of these plans as of December 31, 2018:

	2018 Plan	2014 Plan	2009 Plan	2004 Plan	Directors' Plan
Awards originally available to be granted	2,500,000	1,500,000	3,400,000	6,500,000	N/A
Performance stock options outstanding	—	275,000	—	—	—
Maximum potential RSU and cash settled awards outstanding	25,200	722,035	92,600	35,952	5,522
Maximum potential awards outstanding	25,200	997,035	92,600	35,952	5,522
RSUs and cash settled awards vested and released	—	—	—	—	—
Awards available to be granted	2,474,800	—	—	—	—

Summary of Service-Based Restricted Stock Units

A summary of RSUs for all Plans is presented below:

	Units		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at January 1, 2018	399,347		$	14.60
Granted	99,422		26.95
Released	(137,500	)	14.68
Forfeited	(5,679	)	22.07
Outstanding at December 31, 2018	355,590		$	17.91	22.46	$	9,206
Releasable at December 31, 2018	209,474		$	13.76	33.63	$	5,423

Schedule of Weighted Average Grant Date Fair Value and Intrinsic Value of RSU's

	Years Ended December 31,
	2018		2017		2016
Weighted-average grant date fair value	$	26.95	$	24.32	$	15.07
Intrinsic value of RSUs released	$	4,015	$	4,485	$	1,520

Summary of Changes of Nonvested RSU's

A summary of nonvested RSUs is presented below:

	RSUs		Weighted Average Grant Date Fair Value
Nonvested at January 1, 2018	139,536		$	18.56
Granted	99,422		26.95
Vested	(87,163	)	19.05
Forfeited	(5,679	)	22.07
Nonvested at December 31, 2018	146,116		$	23.84

Schedule of Components of Performance-Based RSU's

A summary of PSUs for all Plans is presented below:

	Units		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at January 1, 2018	271,305		$	18.77
Granted	72,043		28.75
Released	(72,456	)	18.66
Forfeited	(21,700	)	17.66
Added by performance factor	18,600		17.66
Outstanding at December 31, 2018	267,792		$	21.44	1.14	$	6,933
Releasable at December 31, 2018	—		$	—	—	$	—

The following table summarizes each grant of performance awards outstanding at December 31, 2018:

Description	Grant Date	Vesting Year	Vesting Dependency	Target Units  Outstanding	Maximum Number of Units to be Granted
2016-2018 Performance RSUs	February 16, 2016	2018	35% RTSR, 35% sales growth, 30% cash flow	92,840	185,680
Single Crystal Performance RSUs	March 31, 2016	2018	Various	4,000	8,000
2017-2019 Performance RSUs	February 9, 2017	2019	35% RTSR, 35% sales growth, 30% cash flow	71,796	143,592
2017-2019 Performance RSUs	February 9, 2017	2020	Operating Income	27,113	27,113
2018-2020 Performance RSUs	February 8, 2018	2021	35% RTSR, 35% sales growth, 30% cash flow	40,223	80,446
2018- 2020 Performance RSUs	February 16, 2018	2021	35% RTSR, 35% sales growth, 30% cash flow	31,820	63,640
Total				267,792	508,471