Employee Stock Plans - Performance Share Units Award Activity (Details) - Performance Shares shares in Thousands	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Number of PSUs
Non-vested beginning balance (in shares) | shares	307
Granted (in shares) | shares	140
Adjustments for performance results (in shares) | shares	26
Non-vested ending balance (in shares) | shares	473
Grant Date Fair Value Per Unit
Outstanding beginning balance (in dollars per share) | $ / shares	$ 22.18
Granted (in dollars per share) | $ / shares	27.56
Adjustments for performance results (in dollars per share) | $ / shares	19.82
Outstanding ending balance (in dollars per share) | $ / shares	$ 23.64