Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Schedule of Stock Based Compensation Expense

Stock-based compensation expense was as follows for the years ended December 31, 2019, 2018, and 2017 (in thousands):

	Year Ended December 31,
	2019		2018		2017
Restricted stock units	$	4,141	$	4,014	$	5,301
Performance units		3,706		3,497		3,622
Restricted and unrestricted stock		937		380		378
Total expense	$	8,784	$	7,891	$	9,301

Summary of Employee Restricted Stock Unit Awards Activity

A summary of employee restricted stock unit awards activity during the year ended December 31, 2019 is as follows:

	Number of shares			Weighted average grant date fair value		Aggregate intrinsic value (in thousands)
Total awarded and unvested, December 31, 2018		233,960		$	29.27	$	3,685
Granted		417,584			6.46
Vested		(212,140	)		28.71
Forfeited		(1,845	)		13.11
Total awarded and unvested, December 31, 2019		437,559		$	7.83	$	3,474

Summary of Performance Stock Unit Awards Activity

A summary of performance stock unit awards activity during the year ended December 31, 2019 is as follows:

	Number of shares			Weighted average grant date fair value		Aggregate intrinsic value (in thousands)
Total awarded and unvested, December 31, 2018		346,589		$	27.68	$	716
Granted		261,139			7.25
Vested		(270,068	)		27.57
Forfeited		(17,540	)		24.86
Total awarded and unvested, December 31, 2019		320,120		$	11.26	$	2,522

Performance Units [Member]

Assumptions Used to Determine Fair Value of Performance Stock Units Granted

The following table presents the assumptions used to determine the fair value for performance stock units granted during the years ended December 31, 2019, 2018, and 2017:

	Year Ended December 31,
	2019			2018			2017
Volatility		65.10	%		89.70	%		50.41	%
Risk-free interest rate		1.83	%		2.37	%		1.34	%