Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Stock-based Compensation

Summary of the stock-based compensation activity

	Quarter ended March 31,
	2022		2021
	(in thousands)
Grants:
Units:
Performance-based restricted share units ("RSUs")		342		310
Stock options		574		249
Time-based RSUs		331		171
Grant date fair value:
Performance-based RSUs	$	19,522	$	18,234
Stock options		12,138		5,116
Time-based RSUs		18,903		10,064
Total	$	50,563	$	33,414
Vestings and exercises:
Performance-based RSUs vested		643		640
Stock options exercised		44		88
Time-based RSUs vested		244		305
Compensation expense	$	9,275	$	10,877