Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

Stock-based Compensation Expense

The following table provides detail as to expenses recorded within operating income with respect to stock based compensation:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
2016 Plan	$	—	$	1,083
2017 Plan	—		1,195
2018 Plan	(1,242)		1,275
Sign on RSU incentive	134		—
2019 Plan	(30)		—
Total expenses	$	(1,139)	$	3,553

Summary of Activity of PSUs

In the following table summarizes the activity of our PSUs within the three months ended March 31, 2020:

Period granted	Performance period	PSUs outstanding at January 1,	PSUs granted	Performance based adjustment	PSUs settled	PSUs forfeited	PSUs outstanding at March 31,	PSUs expected to vest	Weighted average grant date fair value
2017	2017 - 2020	418,252	—	(40,087)	(378,165)	—	—	—	$	24.89
2018	2018 - 2021	355,766	—	—	—	(2,949)	352,817	299,418	$	39.24
2019	2019 - 2022	229,727	—	—	—	(1,895)	227,832	215,933	$	11.48
	Total 2020	1,003,745	—	(40,087)	(378,165)	(4,844)	580,649	515,351

Summary of Activity of RSUs

In the following table summarizes the activity of our RSUs within the three months ended March 31, 2020:

Period granted	Vesting period	RSUs outstanding January 1,	RSUs granted	Performance based adjustment	RSUs settled	RSUs forfeited	RSUs outstanding at March 31,	RSUs expected to vest	Weighted average grant date fair value
Sign-on RSUs:
2018	2018 - 2021	23,878	—	—	—	—	23,878	23,878	$	25.81
2019	2019 - 2022	45,257	—	—	—	—	45,257	45,257	$	15.89
2019 Plan:
2019	2019 - 2022	128,447	—	—	—	(1,895)	126,552	126,552	$	14.74
	Total 2020	197,582	—	—	—	(1,895)	195,687	195,687

Model for Calculating Fair Value

The following table lists the inputs to the valuation model used for calculating the grant date fair values under the 2019, 2018 and 2017 Plans:

	2017 Plan	2018 Plan	2019 Plan PSU
Expected term (in years)	3	3	3
Dividend yield (%)	1.88%	1.94%	4.65%
Expected volatility OEC (%)	33.77%	30.22%	33.30%
Expected volatility peer group (%)	17.30%	20.09%	17.62%
Correlation	0.4574	0.3659	0.5205
Risk-free interest rate (%)	1.45%	1.46%	1.83%
Model used	Monte Carlo	Monte Carlo	Monte Carlo
Weighted average fair value of PSUs granted	$24.89	$39.24	$11.48

Components of Stock-based Compensation Expense

Stock-based compensation expense is comprised of the following line items:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Cost of sales	$	29	$	12
Selling expenses	(172)		737
General and administrative expenses	(910)		2,598
Research and development costs	(87)		206
Stock-based compensation expense	$	(1,139)	$	3,553