Equity-Based compensation (Tables)

12 Months Ended

Dec. 31, 2016

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,
	2016		2015		2014
Service-Based RSUs	$	1,997	$	1,944	$	1,771
Performance-Based RSUs	665		1,235		872
Cash-settled awards	$	76	$	16	$	17
Total	$	2,738	$	3,195	$	2,660
Income tax benefit	$	1,029	$	1,201	$	1,000

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, 2016		Weighted- average period
Service-Based RSUs	$	1,625	1.12 years
Performance-Based RSUs	1,231		1.73 years
Total	$	2,856	1.38 years

Summary of Status of Equity-Based Compensation Plans

The following table summarizes the status of these plans as of December 31, 2016:

	2014 Plan	2009 Plan	2004 Plan	Directors' Plan
Awards originally available to be granted	1,500,000	3,400,000	6,500,000	N/A
Performance stock options outstanding	320,000	—	—	—
Maximum potential RSU and cash settled awards outstanding	609,511	212,849	78,947	25,985
Maximum potential awards outstanding	929,511	212,849	78,947	25,985
RSUs and cash settled awards vested and released	54,544	—	—	—
Awards available to be granted	515,945	—	—	—

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, 2016	505,170		$	13.13
Granted	195,266		15.07
Released	(102,967	)	14.27
Forfeited	(42,991	)	16.75
Outstanding at December 31, 2016	554,478		$	13.37	21.8	$	12,420
Releasable at December 31, 2016	303,233		$	11.34	33.7	$	6,792

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

	Years Ended December 31,
	2016		2015		2014
Weighted-average grant date fair value	$	15.07	$	17.31	$	9.00
Intrinsic value of RSUs released	$	1,520	$	2,933	$	5,670

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, 2016	218,849		$	16.29
Granted	195,266		15.07
Vested	(126,944	)	15.19
Forfeited	(35,926	)	16.75
Nonvested at December 31, 2016	251,245		15.81

Summary of Fair Value of Restricted Stock Units Vested

	Years Ended December 31,
	2016		2015		2014
Fair value of RSUs vested	$	1,928	$	1,908	$	2,055

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, 2016	249,560		$	15.14
Granted	108,650		13.56
Released	(234,517	)	11.82
Forfeited	(18,810	)	15.86
Added by performance factor	97,017		$	11.81
Outstanding at December 31, 2016	201,900		$	16.48	44.2	$	4,523
Releasable at December 31, 2016	—		$	—	—	$	—

The following table summarizes each grant of performance awards outstanding at December 31, 2016:

Description	Grant Date	Vesting Year	Vesting Dependency	Target Units  Outstanding	Maximum Number of Units to be Granted
2014-2016 Performance RSUs	February 14, 2014	2017	35% RTSR, 35% sales growth, 30% cash flow	43,060	86,120
2015-2017 Performance RSUs	February 5, 2015	2018	35% RTSR, 35% sales growth, 30% cash flow	62,000	124,000
2016-2018 Performance RSUs	February 16, 2016	2019	35% RTSR, 35% sales growth, 30% cash flow	92,840	185,680
Single Crystal Performance RSUs	March 31, 2016	2019	various	4,000	8,000
				201,900	403,800