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Equity Incentive Program - RSUs (Details) - Restricted Stock Units (RSUs)	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 10 months 24 days
Number of Shares [Roll Forward]
Beginning balance | shares	1,909,786
Granted | shares	1,010,984
Vested (1) | shares	(874,641)
Forfeited | shares	(92,733)
Ending balance | shares	1,953,396
Weighted Average Grant Date Fair Value
Beginning balance | $ / shares	$ 16.14
Granted | $ / shares	20.65
Vested (1) | $ / shares	15.54
Forfeited | $ / shares	17.79
Ending balance | $ / shares	$ 18.61

X

- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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