Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement, Noncash Expense [Abstract]

Schedule of components of stock compensation expense

The components of stock compensation expense were as follows:

	Year Ended December 31,
	2020		2019
	(in thousands)
2007 Stock Incentive Plan	$	3,142	$	4,584
2018 Stock Incentive Plan	7,960		3,117
Employee Stock Purchase Plan	276		86
Total Stock Compensation Expense	$	11,378	$	7,787

Summary of restricted stock activity

The following table summarizes restricted stock activity under the 2007 and 2018 Plans for the years ended December 31, 2020 and 2019:

	Number Outstanding	Weighted Average Grant Date Fair Value		Aggregate Grant Date Fair Value (in thousands)
Balance as of December 31, 2018	417,890	$	30.54	$	12,763
Shares granted	279,400	42.28		11,813
Shares forfeited	(3,866)	30.43		(118)
Shares vested	(187,957)	28.74		(5,402)
Balance as of December 31, 2019	505,467	37.70		19,056
Shares granted	319,350	19.00		6,068
Shares forfeited	—	—		—
Shares vested	(243,102)	28.35		(6,892)
Balance as of December 31, 2020	581,715	$	31.34	$	18,232